10-Q 1 appn-20210930.htm 10-Q appn-20210930
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 10-Q
(Mark One)
☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2021
OR
☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from          to         
Commission File Number: 001-38098 
appn-20210930_g1.jpg
APPIAN CORPORATION
(Exact Name of Registrant as Specified in its Charter)
Delaware54-1956084
(State or other jurisdiction of incorporation or organization)
(I.R.S. Employer Identification No.)
7950 Jones Branch Drive
McLean, VA
22102
(Address of principal executive offices)
(Zip Code)
Registrant’s telephone number, including area code: (703) 442-8844
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading symbolName of each exchange on which registered
Class A Common StockAPPNThe Nasdaq Stock Market LLC
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
 
Large accelerated filer☒Accelerated filer
☐
Non-accelerated filer
☐
Small reporting company☐
Emerging growth company☐


If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐   

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes   ☐    No  ☒

As of November 1, 2021, there were 39,683,710 shares of the registrant’s Class A common stock and 31,499,516 shares of the registrant’s Class B common stock, each with a par value of $0.0001 per share, outstanding.




Table of Contents
Page
PART I.
Item 1.
Item 2.
Item 3.
Item 4.
PART II.
Item 1.
Item 1A.
Item 2.
Item 3.
Item 4.
Item 5.
Item 6.

3

PART I—FINANCIAL INFORMATION
Item 1. FINANCIAL STATEMENTS
APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands, except share and per share data) 
As of
September 30, 2021December 31, 2020
(unaudited)
Assets
Current assets
Cash and cash equivalents$127,122 $112,462 
Short-term investments and marketable securities61,384 109,826 
Accounts receivable, net of allowance of $1,400 as of each of September 30, 2021 and December 31, 2020
110,223 97,278 
Deferred commissions, current21,632 17,899 
Prepaid expenses and other current assets26,208 27,955 
Total current assets346,569 365,420 
Property and equipment, net34,280 35,404 
Long-term investments— 36,120 
Goodwill27,414 4,862 
Intangible assets, net of accumulated amortization of $902 and $429 as of September 30, 2021 and December 31, 2020, respectively
8,527 1,744 
Operating right-of-use assets29,218 30,659 
Deferred commissions, net of current portion42,035 34,198 
Deferred tax assets991 489 
Restricted cash, non-current3,240 — 
Other assets2,096 3,625 
Total assets$494,370 $512,521 
Liabilities and Stockholders’ Equity
Current liabilities
Accounts payable$9,899 $2,967 
Accrued expenses10,278 5,821 
Accrued compensation and related benefits28,727 22,981 
Deferred revenue, current122,833 116,256 
Operating lease liabilities, current6,606 6,923 
Other current liabilities77 940 
Total current liabilities178,420 155,888 
Operating lease liabilities, net of current portion49,592 51,194 
Deferred revenue, net of current portion2,041 3,886 
Deferred tax liabilities82 70 
Other non-current liabilities7,759 4,878 
Total liabilities237,894 215,916 
Stockholders’ equity
Class A common stock—par value $0.0001; 500,000,000 shares authorized and 39,667,317 shares issued and outstanding as of September 30, 2021; 500,000,000 shares authorized and 38,971,324 shares issued and outstanding as of December 31, 2020
4 4 
Class B common stock—par value $0.0001; 100,000,000 shares authorized and 31,499,516 shares issued and outstanding as of September 30, 2021; 100,000,000 shares authorized and 31,707,866 shares issued and outstanding as of December 31, 2020
3 3 
Additional paid-in capital490,565 470,498 
Accumulated other comprehensive loss(2,410)(5,010)
Accumulated deficit(231,686)(168,890)
Total stockholders’ equity256,476 296,605 
Total liabilities and stockholders’ equity$494,370 $512,521 
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.


4

APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(unaudited, in thousands, except share and per share data)

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Revenue
Subscriptions$67,240 $50,760 $187,952 $142,614 
Professional services25,177 26,544 76,319 80,329 
Total revenue92,417 77,304 264,271 222,943 
Cost of revenue
Subscriptions7,092 5,101 19,806 15,185 
Professional services19,415 16,450 56,065 51,641 
Total cost of revenue26,507 21,551 75,871 66,826 
Gross profit65,910 55,753 188,400 156,117 
Operating expenses
Sales and marketing42,071 31,633 118,575 94,891 
Research and development26,510 18,150 71,062 51,366 
General and administrative20,226 13,485 56,726 38,076 
Total operating expenses88,807 63,268 246,363 184,333 
Operating loss(22,897)(7,515)(57,963)(28,216)
Other expense (income)
Other expense (income), net2,329 (4,277)4,141 (1,845)
Interest expense72 119 233 390 
Total other expense (income)2,401 (4,158)4,374 (1,455)
Loss before income taxes(25,298)(3,357)(62,337)(26,761)
Income tax expense86 255 459 335 
Net loss$(25,384)$(3,612)$(62,796)$(27,096)
Net loss per share:
Basic and diluted$(0.36)$(0.05)$(0.89)$(0.39)
Weighted average common shares outstanding:
Basic and diluted71,118,881 69,923,553 70,935,585 68,611,994 
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.



5

APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
(unaudited, in thousands)

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Net loss$(25,384)$(3,612)$(62,796)$(27,096)
Comprehensive income (loss), net of income taxes
Foreign currency translation adjustment28 (1,960)2,569 (2,157)
Unrealized gains on available-for-sale securities— — 31 — 
Total other comprehensive loss, net of income taxes$(25,356)$(5,572)$(60,196)$(29,253)
 The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
6

APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
(unaudited, in thousands, except share data)

Accumulated Other Comprehensive (Loss) IncomeTotal Stockholders' Equity
Common StockAdditional Paid-In CapitalAccumulated Deficit
SharesAmount
Balance, January 1, 202170,679,190 $7 $470,498 $(5,010)$(168,890)$296,605 
Net loss— — — — (13,587)(13,587)
Issuance of common stock to directors960 — — — — — 
Vesting of restricted stock units56,326 — — — — — 
Exercise of stock options88,269 — 625 — — 625 
Stock-based compensation expense— — 7,894 — — 7,894 
Other comprehensive income— — — 4,023 — 4,023 
Balance, March 31, 202170,824,745 7 479,017 (987)(182,477)295,560 
Net loss— — — — (23,825)(23,825)
Issuance of common stock to directors1,175 — — — — — 
Vesting of restricted stock units43,024 — — — — — 
Exercise of stock options211,651 — 1,464 — — 1,464 
Stock-based compensation expense— — 4,598 — — 4,598 
Other comprehensive loss— — — (1,451)— (1,451)
Balance, June 30, 202171,080,595 7 485,079 (2,438)(206,302)276,346 
Net loss— — — — (25,384)(25,384)
Issuance of common stock to directors1,130 — — — — — 
Vesting of restricted stock units38,148 — — — — — 
Exercise of stock options46,960 — 286 — — 286 
Stock-based compensation expense— — 5,200 — — 5,200 
Other comprehensive income— — — 28 — 28 
Balance, September 30, 202171,166,833 $7 $490,565 $(2,410)$(231,686)$256,476 
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.








7


APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
(unaudited, in thousands, except share data)

Accumulated Other Comprehensive (Loss) IncomeTotal Stockholders' Equity
Common StockAdditional Paid-In CapitalAccumulated Deficit
SharesAmount
Balance, January 1, 202067,468,022 $6 $340,929 $(285)$(135,413)$205,237 
Net loss— — — — (11,669)(11,669)
Issuance of common stock to directors1,946 — — — — — 
Vesting of restricted stock units46,031 — — — — — 
Exercise of stock options129,082 — 670 — — 670 
Stock-based compensation expense— — 3,476 — — 3,476 
Other comprehensive income— — — 17 — 17 
Balance, March 31, 202067,645,081 6 345,075 (268)(147,082)197,731 
Net loss— — — — (11,815)(11,815)
Issuance of common stock from public offering, net of issuance costs1,931,206 1 107,914 — — 107,915 
Issuance of common stock to directors2,296 — — — — — 
Vesting of restricted stock units13,567 — — — — — 
Exercise of stock options248,165 — 1,571 — — 1,571 
Stock-based compensation expense— — 3,614 — — 3,614 
Other comprehensive loss— — — (214)— (214)
Balance, June 30, 202069,840,315 7 458,174 (482)(158,897)298,802 
Net loss— — — — (3,612)(3,612)
Issuance of common stock to directors2,417 — — — — — 
Vesting of restricted stock units33,641 — — — — — 
Exercise of stock options143,816 — 934 — — 934 
Stock-based compensation expense— — 3,578 — — 3,578 
Other comprehensive loss— — — (1,960)— (1,960)
Balance, September 30, 202070,020,189 $7 $462,686 $(2,442)$(162,509)$297,742 
8

APPIAN CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited, in thousands)

Nine Months Ended September 30,
20212020
Cash flows from operating activities:
Net loss$(62,796)$(27,096)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization4,071 4,485 
Bad debt expense61 778 
Loss on disposal of property and equipment78 22 
Change in fair value of available-for-sale securities(31)— 
Deferred income taxes(522)(162)
Stock-based compensation17,692 10,668 
Changes in assets and liabilities:
Accounts receivable(10,005)(22,594)
Prepaid expenses and other assets2,734 4,491 
Deferred commissions(11,570)(4,349)
Accounts payable and accrued expenses10,797 (2,456)
Accrued compensation and related benefits5,782 5,844 
Other current and non-current liabilities2,858 2,963 
Deferred revenue6,829 10,531 
Operating lease liabilities(476)3,422 
Net cash used in operating activities(34,498)(13,453)
Cash flows from investing activities:
Proceeds from sale of investments84,592 — 
Payments for acquisitions, net of cash acquired(30,729)(6,138)
Purchases of property and equipment(2,473)(1,036)
Net cash provided by (used in) investing activities51,390 (7,174)
Cash flows from financing activities:
Principal payments on finance leases— (1,080)
Proceeds from public offering, net of underwriting discounts— 108,260 
Payments of costs related to public offerings— (18)
Proceeds from exercise of common stock options2,375 3,175 
Net cash provided by financing activities2,375 110,337 
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash(1,367)1,623 
Net increase in cash, cash equivalents, and restricted cash17,900 91,333 
Cash, cash equivalents, and restricted cash at beginning of period112,462 159,755 
Cash, cash equivalents, and restricted cash at end of period$130,362 $251,088 
Supplemental disclosure of cash flow information:
Cash paid for interest$240 $116 
Cash paid for income taxes$1,196 $630 
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
9
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)

1. Organization and Description of Business

Appian Corporation (together with its subsidiaries, “Appian,” the “Company,” “we,” or “our”) helps organizations build applications and workflows rapidly, with a low-code automation platform. Combining people, technologies, and data in a single workflow, Appian can help companies maximize their resources and improve business results. Many of the world’s largest organizations use Appian applications to improve customer experience, achieve operational excellence, and simplify global risk management and compliance. We were incorporated in the state of Delaware in August 1999. We are headquartered in McLean, Virginia and operate in Canada, Switzerland, the United Kingdom, France, Germany, the Netherlands, Italy, Australia, Spain, Singapore, Sweden, and Japan.

2. Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements and footnotes have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) as contained in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) for interim financial information. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of the results of operations, financial position, changes in stockholders’ equity, and cash flows. The results of operations for the current period are not necessarily indicative of the results for the full year or the results for any future periods. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related footnotes included in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the Securities and Exchange Commission (the “SEC”) on February 18, 2021.

Use of Estimates

The preparation of our condensed consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and judgments that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Although we believe the estimates we use are reasonable, due to the inherent uncertainty involved in making these estimates, actual results reported in future periods could differ from those estimates.

Significant estimates embedded in the condensed consolidated financial statements include revenue recognition, income taxes and the related valuation allowance, the valuation of goodwill and intangible assets, leases, costs to obtain a contract with a customer, the valuation of financial instruments, and stock-based compensation.

The ongoing outbreak of the novel coronavirus disease ("COVID-19") has resulted in the declaration of a global pandemic and introduced a level of disruption and uncertainty into the financial markets and global economy. While we continue to monitor the developments surrounding the pandemic, as of the date of issuance of these financial statements, we are not aware of any specific events or circumstances that would require us to update our estimates, assumptions, and judgments or revise the carrying value of our assets or liabilities. We cannot estimate the impacts COVID-19 may have on our business going forward as such impacts will be largely dependent upon a number of factors outside of our control including the extent and duration of the outbreak as well as any mitigating actions which may be undertaken by global governments and the general public.

Principles of Consolidation

The accompanying condensed consolidated financial statements include the accounts of Appian and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Public Offering

In June 2020, we completed an underwritten public offering of 2,500,000 shares of our Class A common stock, of which 1,931,206 shares of Class A common stock were sold by us and 568,794 shares of Class A common stock were sold by existing stockholders. The underwriter purchased the shares from us and the selling stockholders at a price of $56.50 per share. Our net
10
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
proceeds from the offering were $107.9 million, after deducting underwriting discounts and commissions and offering expenses. We did not receive any of the proceeds from the sale of shares by the selling stockholders.

Revenue Recognition

Refer to Note 3 for a detailed discussion on specific revenue recognition principles related to our major revenue streams.

Cost of Revenue

Subscriptions

Cost of subscriptions revenue consists primarily of fees paid to our third-party managed hosting providers and other third-party service providers, personnel costs such as payroll and benefits for our technology operations and customer support teams, and allocated facility costs and overhead.

Professional Services

Cost of professional services revenue includes all direct and indirect costs to deliver our professional services and training, including employee compensation for our global professional services and training personnel, third-party contractor costs, allocated facility costs and overhead, and the costs of billable expenses such as travel and lodging. The unpredictability of the timing of entering into significant professional services agreements sold on a standalone basis may cause significant fluctuations in our quarterly financial results and allocated facility costs and overhead.

Concentration of Credit and Customer Risk

Our financial instruments exposed to concentration of credit and customer risk consist primarily of cash, cash equivalents, and restricted cash, accounts receivable, and our short- and long-term investments. Deposits held with banks may exceed the amount of insurance provided on such deposits; however, we believe the financial institutions holding our cash deposits are financially sound and, accordingly, minimal credit risk exists with respect to these balances.

With regard to our customers, credit evaluation and account monitoring procedures are used to minimize the risk of loss. We believe no additional credit risk beyond amounts provided for collection loss are inherent in accounts receivable. Revenue generated from government agencies represented 19.2% and 20.0% of our revenue for the three and nine months ended September 30, 2021, respectively, of which the top three U.S. federal government agencies generated 7.5% and 6.3% of our revenue for the three and nine months ended September 30, 2021, respectively. Additionally, 32.0% and 33.1% of our revenue during the three and nine months ended September 30, 2021, respectively, was generated from foreign customers. Revenue generated from government agencies represented 19.9% and 17.9% of our revenue for the three and nine months ended September 30, 2020, respectively, of which the top three U.S. federal government agencies generated 8.7% and 7.4% of our revenue for the three and nine months ended September 30, 2020, respectively. Additionally, 32.2% and 34.0% of our revenue during the three and nine months ended September 30, 2020, respectively, was generated from foreign customers.

Cash, Cash Equivalents, and Restricted Cash

We consider all highly liquid investments with an original or remaining maturity of three months or less at the date of purchase, as well as overnight repurchase agreements, to be cash equivalents. Restricted cash consists of cash designated to settle an escrow liability stemming from a holdback agreement enacted pursuant to our acquisition of Lana Labs GmbH ("Lana Labs"). The restrictions on 25% of the restricted cash balance will lapse on the later of either two months following the establishment of Lana Labs' annual financial statements for the year ended December 31, 2021 or October 31, 2022. The restrictions on the remaining 75% of the balance will lapse on August 11, 2023.

The following table presents a reconciliation of cash, cash equivalents, and restricted cash as presented in the condensed consolidated statements of cash flows:

11
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
As of September 30,
20212020
Cash and cash equivalents$127,122 $251,088 
Restricted cash, non-current3,240 — 
Total cash, cash equivalents, and restricted cash$130,362 $251,088 

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are stated at realizable value, net of an allowance for doubtful accounts. The allowance for doubtful accounts is based on our assessment of the collectability of accounts and incorporates an estimation of expected lifetime credit losses on our receivables. We regularly review the composition of the accounts receivable aging, historical bad debts, changes in payment patterns, customer creditworthiness, and current economic trends. If the financial condition of our customers were to deteriorate, resulting in their inability to make required payments, additional provisions for doubtful accounts would be required and would increase bad debt expense. There was no increase in the allowance for doubtful accounts from December 31, 2020 to September 30, 2021.

Assets Recognized from the Costs to Obtain a Contract with a Customer

We capitalize costs of obtaining a contract with a customer, including sales commissions paid to our direct sales force, that are incremental costs to obtaining customer contracts. These costs are recorded as deferred commissions in the condensed consolidated balance sheets. Costs to obtain a contract for a new customer or upsell are amortized over an estimated economic life of five years as sales commissions on initial sales are not commensurate with sales commissions on contract renewals. We determine the estimated economic life based on both qualitative and quantitative factors such as expected renewals, product life cycles, contractual terms, and customer attrition. We periodically review the carrying amount of deferred contract acquisition costs to determine whether events or changes in circumstances have occurred that could impact the estimated economic life. Commissions paid relating to contract renewals are deferred and amortized over the related renewal period. We also capitalize the incremental fringe benefits associated with commission expenses paid to our direct sales force. Costs to obtain a contract for professional services arrangements are expensed as incurred as the contractual period of our professional services arrangements are one year or less.

Amortization associated with deferred commissions is recorded to sales and marketing costs in our condensed consolidated statements of operations. Commission expense was $8.2 million and $22.5 million for the three and nine months ended September 30, 2021, respectively. Commission expense was $5.6 million and $16.7 million for the three and nine months ended September 30, 2020, respectively.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Significant additions or improvements extending the useful life of an asset are capitalized, while repairs and maintenance costs which do not significantly improve the related assets or extend their useful lives are charged to expense as incurred.

The following table outlines the useful lives of our major asset categories:

Asset CategoryUseful Life (in years)
Computer software3
Computer hardware3
Equipment5
Office furniture and fixtures10
Leasehold improvements
(a)
(a) Leasehold improvements have an estimated useful life of the shorter of the useful life of the assets or the lease term.

12
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
Business Combinations

We account for business combinations using the acquisition method of accounting as of the business combination date. Under this method, we allocate the fair value of purchase consideration to identifiable tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the consideration transferred over the fair value of the identifiable net assets acquired is recorded as goodwill and represents the future economic benefits expected to arise from other intangible assets acquired that do not qualify for separate recognition, including assembled workforce, non-contractual relationships, and expected future synergies. Determining the fair value of assets acquired and liabilities assumed requires us to use significant judgments and estimates, including the selection of valuation methodologies, estimates of future revenue, costs, and cash flows, and discount rates.

During the measurement period, which can be up to one year from the acquisition date, these estimates may be refined, as necessary, and we may record adjustments to the fair value of tangible and intangible assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period or the final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our condensed consolidated statements of operations. Acquisition related expenses and post-acquisition integration costs are recognized separately from the business combination and are expensed as incurred.

Acquired property and equipment is depreciated on a straight-line basis over the assets' respective estimated remaining useful lives.

Impairment of Goodwill and Long-Lived Assets

Long-lived assets and certain intangible assets are reviewed for impairment at least annually or more frequently whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable through undiscounted cash flows from the use of the assets. If such assets are considered to be impaired, the assets are written down to their estimated fair value.

With respect to goodwill, we have the option to qualitatively assess whether it is more likely than not the fair value of a reporting unit is less than its carrying value. If we elect to perform a qualitative assessment and conclude it is more likely than not the fair value of the reporting unit is equal to or greater than its carrying value, no further assessment of that reporting unit’s goodwill is necessary; otherwise, goodwill must be tested for impairment. Absent a specifically identified triggering event, we historically perform our annual assessment on the first day of the fourth quarter.

Because we operate under one reporting unit, the fair value of our reporting unit is based on our enterprise value. No indicators of impairment were identified for the three and nine months ended September 30, 2021 and 2020.

Investments and Fair Value of Financial Instruments

Refer to Note 15 for a detailed discussion on our policies specific to investments and determining fair value.

Stock-Based Compensation

We account for stock-based compensation expense related to stock-based awards based on the estimated fair value of the award on the grant date. We calculate the fair value of stock options containing only a service condition using the Black-Scholes option pricing model. The fair value of restricted stock units ("RSUs") is based on the closing market price of our common stock on the Nasdaq Global Market on the date of grant. For service-based awards such as RSUs, stock-based compensation expense is recognized on a straight-line basis over the requisite service period. For performance-based awards, stock-based compensation expense is recognized using the accelerated attribution method based on the probability of satisfying the performance condition. For awards that contain market conditions, compensation expense is measured using a Monte Carlo simulation and recognized using the accelerated attribution method over the derived service period based on the expected market performance as of the grant date. We account for forfeitures as they occur rather than estimating expected forfeitures.

Leases

13
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
Refer to Note 4 for a detailed discussion on our policies specific to leasing arrangements.

Recent Accounting Pronouncements

Adopted

In December 2019, the FASB issued Accounting Standards Update ("ASU") 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which amends and aims to simplify accounting disclosure requirements regarding a number of topics including, but not limited to, intraperiod tax allocations, accounting for deferred taxes when there are changes in the consolidation of certain investments, tax basis step ups in an acquisition, and the application of effective rate changes during interim periods. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of the new guidance did not have a material impact on our condensed consolidated financial statements.

Not Yet Adopted

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform - Facilitation of the Effects of Reference Rate Reform on Financial Reporting (Topic 848), which provides temporary optional expedients and exceptions to the GAAP guidance on contract modifications to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative reference rates such as the Secured Overnight Financing Rate ("SOFR"). This guidance is effective upon issuance and generally can be applied through the end of calendar year 2022. We are currently evaluating the impact and applicability of this new standard.

In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which aims to improve the accounting for acquired revenue contracts with customers in a business combination. The ASU requires an entity (acquirer) to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. The guidance is effective for fiscal years beginning after December 15, 2022 and interim periods within those fiscal years. Early adoption is permitted including in interim periods. We are currently evaluating the impact and applicability of this new standard.

3. Revenue

Revenue Recognition

We generate subscriptions revenue primarily through the sale of software as a service ("SaaS") subscriptions bundled with maintenance and support and hosting services as well as term license subscriptions bundled with maintenance and support. We generate professional services revenue from fees for our consulting services, including application development and deployment assistance as well as training related to our platform.

The following table summarizes revenue from contracts with customers for the three and nine months ended September 30, 2021 and 2020 (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
SaaS subscriptions$46,699 $34,312 $128,238 $92,282 
Term license subscriptions15,114 11,830 44,290 37,002 
Maintenance and support5,427 4,618 15,424 13,330 
Total subscriptions67,240 50,760 187,952 142,614 
Professional services25,177 26,544 76,319 80,329 
Total revenue$92,417 $77,304 $264,271 $222,943 

Performance Obligations and Timing of Revenue Recognition

14
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
We primarily sell products and services that fall into the categories discussed below. Each category contains one or more performance obligations that are either (1) capable of being distinct (i.e., the customer can benefit from the product or service on its own or together with readily available resources, including those purchased separately from us) and distinct within the context of the contract (i.e., separately identified from other promises in the contract) or (2) a series of distinct products or services that are substantially the same and have the same pattern of transfer to the customer. Our term license subscriptions are delivered at a point in time while our SaaS subscriptions, maintenance and support, and professional services are delivered over time.

Subscriptions Revenue

Subscriptions revenue is primarily related to (1) SaaS subscriptions bundled with maintenance and support and hosting services and (2) term license subscriptions bundled with maintenance and support. We generally charge subscription fees on a per-user basis or through non-user based single application licenses. We bill customers and collect payment for subscriptions to our platform in advance on an annual, quarterly, or monthly basis. In certain instances, our customers have paid their entire contract up front.

SaaS Subscriptions

We generate cloud-based subscriptions revenue primarily from the sales of subscriptions to access our cloud offering, together with related support services to our customers. We perform all required maintenance and support for our cloud offering. Revenue is recognized on a ratable basis over the contract term beginning on the date the service is made available to the customer. Our cloud-based subscription contracts generally have a term of one to three years in length. We bill customers and collect payment for subscriptions to our platform in advance, and they are non-cancellable.

Term License Subscriptions

Our term license subscriptions revenue is derived from customers with on-premises installations of our platform pursuant to contracts that were historically one to three years in length. The majority of recent contracts have been one year in length. Although term license subscriptions are sold with maintenance and support, the software is fully functional at the beginning of the subscription and is considered a distinct performance obligation. On rare occasions, a cloud-based subscription may include the right for the customer to take possession of the license and as such, the revenue is treated as a license. Revenue from term license subscriptions is recognized when control of the software license has transferred to the customer, which is the later of delivery or commencement of the contract term.

Maintenance and Support

Maintenance and support subscriptions include both technical support and when-and-if-available software upgrades, which are treated as a single performance obligation as they are considered a series of distinct services that are substantially the same and have the same duration and measure of progress. Revenue from maintenance and support is recognized ratably over the contract period, which is the period over which the customer has continuous access to maintenance and support.

Professional Services Revenue

Our professional services revenue is comprised of fees for consulting services, including application development and deployment assistance as well as training services related to our platform. Our professional services are considered distinct performance obligations when sold standalone or with other products.

Consulting Services

We sell consulting services to assist customers in planning and executing the deployment of our software. Customers are not required to use consulting services to fully benefit from the software. Consulting services are regularly sold on a standalone basis and either (1) under a fixed-fee arrangement or (2) on a time and materials basis. Consulting contracts are each considered separate performance obligations because they do not integrate with each other or with other products and services to deliver a combined output to the customer, do not modify or customize (or are not modified or customized by) each other or other products and services, and do not affect the customer's ability to use the other consulting offerings or other products and
15
APPIAN CORPORATION AND SUBSIDIARIES
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
services. Revenue under consulting contracts is recognized over time as services are delivered. For time and materials-based consulting contracts, we have elected the practical expedient of recognizing revenue upon invoicing since the invoiced amount corresponds directly to the value of our service to date.

Training Services

We sell various training services to our customers. Training services are sold in the form of prepaid training credits that are redeemed based on a fixed rate per course. Training revenue is recognized when the associated training services are delivered.

Significant Judgments and Estimates

Determining the Transaction Price

The transaction price includes both fixed and variable consideration. Variable consideration is included in the transaction price to the extent it is probable a significant reversal will not occur. The amount of variable consideration excluded from the transaction price for the three and nine months ended September 30, 2021 and 2020 was insignificant. Our estimates of variable consideration are also subject to subsequent true-up adjustments and may result in changes to transaction prices; however, such true-up adjustments are not expected to be material.

Allocating the Transaction Price Based on Standalone Selling Prices ("SSP")

We allocate the transaction price to each performance obligation in a contract based on its relative SSP. The SSP is the observable price at which we sell the product or service separately. In the absence of observable pricing, we estimate SSP using the residual approach. We establish SSP as follows:

1.SaaS subscriptions - Given the highly variable selling price of our SaaS subscriptions, we establish the SSP of our SaaS subscriptions using a residual approach after first determining the SSP of consulting and training services. We have concluded the residual approach to estimating SSP of our SaaS subscriptions is an appropriate allocation of the transaction price.

2.Term license subscriptions - Given the highly variable selling price of our term license subscriptions, we have established SSP of term license subscriptions using a residual approach after first determining the SSP of maintenance and support. Maintenance and support is sold on a standalone basis in conjunction with renewals of our legacy perpetual software licenses and within a narrow range of the net license fee. Because an economic relationship exists between the license and maintenance and support, we have concluded the residual approach to estimating SSP of term license subscriptions is an appropriate allocation of the transaction price.

3.Maintenance and support - We establish the SSP of maintenance and support as a percentage of the stated net subscription fee based on observable pricing of maintenance and support renewals from our legacy perpetual software licenses.

4.Consulting and training services - The SSP of consulting and training services is established based on the observable pricing of standalone sales within each geographic region where the services are sold.

Contract Balances

Timing may differ between the satisfaction of performance obligations and the invoicing and collection of amounts related to our contracts with customers. Contract assets primarily relate to unbilled amounts for contracts with customers for which the amount of revenue recognized exceeds the amount billed to the customer. Contract assets are transferred to accounts receivable when the right to invoice becomes unconditional. As of September 30, 2021 and December 31, 2020, contract assets of $13.4 million and $20.1 million, respectively, are included in the Prepaid expenses and other current assets and Other assets line items in our condensed consolidated balance sheets.

Contract liabilities consist of deferred revenue and include payments received in advance of the satisfaction of performance obligations. Deferred revenue is then recognized as the revenue recognition criteria are met. Deferred revenue that will be recognized during the succeeding 12-month period is recorded as current, and the remaining deferred revenue is recorded as
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non-current. For the nine months ended September 30, 2021, we recognized $103.5 million of revenue that was included in the deferred revenue balance as of December 31, 2020.

Transaction Price Allocated to the Remaining Performance Obligations

As of September 30, 2021, we had an aggregate transaction price of $246.7 million allocated to unsatisfied performance obligations. We expect to recognize $223.9 million of this balance as revenue over the next 24 months with the remaining amount recognized thereafter.

4. Leases

At the inception of an arrangement, we determine whether the arrangement is or contains a lease based on the unique facts and circumstances present and the classification of the lease. Operating leases with a term greater than one year are recognized on the balance sheet as right-of-use ("ROU") assets, lease liabilities, and, if applicable, long-term lease liabilities. ROU assets represent our right to use an underlying asset for the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. We have elected not to recognize on our condensed consolidated balance sheets leases with a term of one year or less. For contracts with lease and non-lease components, we have elected not to allocate the contract consideration but rather to account for the lease and non-lease components as a single lease component.

Lease liabilities and their corresponding ROU assets are recorded based on the present value of lease payments over the expected lease term. The implicit rates within most of our leases are generally not determinable; therefore, we use the incremental borrowing rate at the lease commencement date to determine the present value of lease payments. The determination of our incremental borrowing rate requires judgment and is estimated for each lease based on the rate we would have to pay for a collateralized loan with the same term and payments as the lease. We consider various factors, including our level of collateralization, estimated credit rating, and the currency in which the lease is denominated. Operating lease ROU assets also include any lease prepayments, offset by lease incentives. Certain of our leases include options to extend or terminate the lease. An option to extend the lease is considered in connection with determining the ROU asset and lease liability when it is reasonably certain we will exercise that option while an option to terminate is considered unless it is reasonably certain we will not exercise the option. For certain equipment leases, we apply a portfolio approach to effectively account for the operating lease ROU assets and liabilities.

Expense for operating leases is recognized on a straight-line basis over the lease term as an operating expense while the expense for finance leases is recognized as depreciation expense and interest expense. We have lease agreements which require payments for lease and non-lease components (i.e., common area maintenance) that are accounted for as a single lease component. Variable lease payment amounts that cannot be determined at the commencement of the lease, such as maintenance costs based on future obligations, are not included in ROU assets or lease liabilities but rather are expensed as incurred and recorded as variable lease expense.

As of September 30, 2021, we have operating leases for corporate offices. Our operating leases have remaining lease terms of roughly 2 years to 10 years, some of which include options to extend the leases for up to 10 years.

In April 2018, we entered into a lease agreement with respect to 176,222 square feet of office space in McLean, Virginia for a new corporate headquarters. The initial term of the lease was 150 months. We took initial possession of the first phase of the new headquarters in October 2018 and began to recognize rent expense as of that date. In February 2019, we took possession of an additional 28,805 square feet of adjacent office space.

In January 2020, we entered into an amendment which adjusted the original terms of the headquarters lease. Under this amendment, we exercised an option to expand occupancy, adding 34,158 square feet of office space. Occupancy of the added space commenced on October 14, 2020. Pursuant to the guidance of ASC 842, Leases, the amendment is considered a modification to the original lease and is accounted for as a separate contract because it represents a new ROU asset and the lease costs on the new space are charged at prevailing market rates. Effective July 1, 2020, we took possession of the space, began to recognize rent expense, and recorded a $7.9 million ROU asset and lease liability on our condensed consolidated balance sheets.

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(UNAUDITED)
In October 2020, we paid the full $2.7 million principal balances outstanding under our finance leases pursuant to an option permitting us to pay such balances in full at any time. As of the date of the paydown, the titles to the assets were transferred to us, the associated lease liabilities were retired, the carrying values of the purchased assets were adjusted, and the assets were reclassified from finance leases to property and equipment, net on the condensed consolidated balance sheets.

The following table sets forth the components of lease expense for the three and nine months ended September 30, 2021 and 2020 (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Operating lease cost$1,659 $1,695 $4,984 $4,971 
Finance lease costs:
Amortization of right-of-use assets— 373 — 1,118 
Interest on lease liabilities— 41 — 138 
Short-term lease cost23 85 77 465 
Variable lease cost947 1 1,744 218 
Total$2,629 $2,195 $6,805 $6,910 

Supplemental balance sheet information related to operating leases as of September 30, 2021 and December 31, 2020 was as follows (in thousands, except for lease term and discount rate):

As of
September 30, 2021December 31, 2020
Operating right-of-use assets$29,218$30,659
Operating lease liabilities, current$6,606$6,923
Operating lease liabilities, net of current portion49,59251,194
Total operating lease liabilities$56,198$58,117
Weighted average remaining lease term (in years)9.810.6
Weighted average discount rate9.6 %9.6 %

For the three and nine months ended September 30, 2021, amortization of operating ROU assets totaled $0.7 million and $1.4 million, respectively. For the three and nine months ended September 30, 2020, amortization of operating ROU assets totaled $0.4 million and $1.3 million, respectively.

For the three and nine months ended September 30, 2021, interest expense on operating lease liabilities totaled $0.5 million and $1.4 million, respectively. For the three and nine months ended September 30, 2020, interest expense on operating lease liabilities totaled $0.7 million and $2.2 million, respectively.

Supplemental cash flow information related to leases for the nine months ended September 30, 2021 and 2020 was as follows (in thousands):

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
Nine Months Ended September 30,
20212020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows for operating leases$5,295 $1,716 
Operating cash outflows for finance leases— 138 
Financing cash outflows for finance leases— 1,080 

A summary of our future minimum lease commitments under non-cancellable leases as of September 30, 2021 is as follows (in thousands):

Operating Leases
2021 (excluding the nine months ended September 30, 2021)
$626 
20228,450 
20238,311 
20248,634 
20259,330 
20269,366 
Thereafter48,775 
Total lease payments93,492 
Less: imputed interest(37,294)
Total$56,198 

5. Acquisitions

In August 2021, we completed the acquisition of Lana Labs, a developer of process mining software, for approximately $30.7 million, net of cash acquired and debt. The acquisition was made due to the attractive nature of the product offerings of Lana Labs and in furtherance of our objective to enhance our automation platform. The transaction was financed through available cash on hand.

The allocation of the purchase price is preliminary pending the finalization of the fair value of the acquired net assets, liabilities assumed, deferred income taxes, and assumed income and non-income based tax liabilities. As of the acquisition date, the purchase price was assigned to the acquired assets and assumed liabilities as follows (in thousands):

Cash acquired$256 
Other current assets86 
Property and equipment59 
Developed technology6,819 
Customer relationships750 
Goodwill23,443 
Other non-current assets27 
Total assets acquired31,440 
Current liabilities335 
Non-current liabilities120 
Total liabilities assumed455 
Net assets acquired$30,985 
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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)

There were no changes to our reportable segments as a result of the acquisition. From the acquisition date to September 30, 2021, Lana Labs' revenue was immaterial and net loss before taxes was $1.2 million. Acquisition costs incurred in relation to the transaction were immaterial. We do not expect the purchase price allocated to goodwill and intangible assets to be deductible for tax purposes.

6. Property and Equipment, net

Property and equipment, net consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):

September 30, 2021December 31, 2020
Leasehold improvements$37,541 $36,263 
Office furniture and fixtures2,526 2,521 
Computer hardware5,583 4,535 
Computer software1,353 1,352 
Equipment109 49 
Property and equipment, gross47,112 44,720 
Less: accumulated depreciation(12,832)(9,316)
Property and equipment, net$34,280 $35,404 

Depreciation expense totaled $1.2 million and $3.6 million for the three and nine months ended September 30, 2021, respectively. We retired $0.1 million of leasehold improvements during the three and nine months ended September 30, 2021 and similarly recorded $0.1 million in losses on disposal for the three and nine months ended September 30, 2021.

Depreciation expense totaled $1.4 million and $4.2 million for the three and nine months ended September 30, 2020. There were no disposals recorded during the three months ended September 30, 2020. During the nine months ended September 30, 2020, we retired $1.3 million of leasehold improvements, $0.1 million of computer hardware, and $0.1 million of office furniture and fixtures and equipment. Nominal losses on disposal were recorded for the nine months ended September 30, 2020.

7. Accrued Expenses

Accrued expenses consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):

September 30, 2021December 31, 2020
Accrued hosting costs$2,006 $1,229 
Accrued legal costs1,975 760 
Accrued marketing and tradeshow expenses1,868 596 
Accrued third party license fees957 570 
Accrued contract labor costs683 908 
Accrued reimbursable employee expenses481 231 
Accrued audit and tax expenses256 370 
Accrued taxes payable— 527 
Other accrued expenses2,052 630 
Total$10,278 $5,821 

8. Debt

Line of Credit

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
In November 2017, we entered into a $20.0 million revolving line of credit with a lender. The facility matures in November 2022. We may elect whether amounts drawn on the revolving line of credit bear interest at a floating rate per annum equal to either LIBOR or the Prime rate plus an additional interest rate margin that is determined by the availability of the borrowings under the revolving line of credit. The additional interest rate margin will range from 2.00% to 2.50% in the case of LIBOR advances and from 1.00% to 1.50% in the case of Prime rate advances. The revolving line of credit contains an unused facility fee in an amount between 0.15% and 0.25% of the average unused portion of the revolving line of credit, which is payable quarterly. The agreement contains certain customary affirmative and negative covenants and requires us to maintain (i) an adjusted quick ratio of at least 1.35 to 1.00 and (ii) minimum adjusted EBITDA, in the amounts and for the periods set forth in the agreement. Any amounts borrowed under the credit facility are collateralized by substantially all of our assets. We were in compliance with all covenants as of September 30, 2021. As of September 30, 2021, we had no outstanding borrowings under this revolving line of credit, and we had outstanding letters of credit totaling $11.2 million in connection with securing our leased office space. We also continue to monitor the LIBOR to SOFR transition, which may result in modification or amendment of our existing revolving line of credit.

9. Income Taxes

The provision for income taxes is based upon the estimated annual effective tax rates for the year applied to the current period income before tax plus the tax effect of any significant or unusual items, discrete events, or changes in tax law. Our operating subsidiaries are exposed to statutory effective tax rates ranging from zero to approximately 32%. Fluctuations in the distribution of pre-tax income among our operating subsidiaries can lead to fluctuations of the effective tax rate in the condensed consolidated financial statements. For the three and nine months ended September 30, 2021, the actual effective tax rates were (0.3)% and (0.7)%, respectively. For the three and nine months ended September 30, 2020, the actual effective tax rates were (7.6)% and (1.3)%, respectively.

We assess uncertain tax positions in accordance with ASC 740-10, Accounting for Uncertainties in Income Taxes. As of September 30, 2021, our net unrecognized tax benefits totaled $2.3 million, which if recognized would result in no net effect on the effective tax rate due to a valuation allowance. The amount of reasonably possible unrecognized tax benefits that could decrease over the next 12 months due to the expiration of certain statutes of limitations or settlements of tax audits is not material to our condensed consolidated financial statements.

We file income tax returns in the United States federal jurisdiction and in many states and foreign jurisdictions. The tax years 2017 through 2020 remain open to examination by the major taxing jurisdictions to which we are subject. We are not currently under examination by the Internal Revenue Service for any open tax years.

10. Stock-Based Compensation

Equity Incentive Plans

In May 2017, our Board of Directors adopted, and our stockholders approved, the 2017 Equity Incentive Plan (the “2017 Plan”), which became effective as of the date of the final prospectus for our initial public offering. The 2017 Plan provides for the grant of incentive stock options to employees and for the grant of nonstatutory stock options, restricted stock awards, RSUs, stock appreciation rights, performance-based stock awards, and other forms of equity compensation to employees, including officers, non-employee directors, and consultants. We initially reserved 6,421,442 shares of Class A common stock for issuance under the 2017 Plan, which included 421,442 shares that remained available for issuance under our 2007 Stock Option Plan (the “2007 Plan”) at the time the 2017 Plan became effective. The number of shares reserved under the 2017 Plan increases for any shares subject to outstanding awards originally granted under the 2007 Plan that expire or are forfeited prior to exercise. As a result of the adoption of the 2017 Plan, no further grants may be made under the 2007 Plan. As of September 30, 2021, there were 7,177,909 shares of Class A common stock reserved for issuance under the 2017 Plan, of which 4,077,122 were available to be issued.

Stock Options

We estimate the fair value of stock options containing only a service condition using the Black-Scholes option pricing model, which requires the use of subjective assumptions, including the expected term of the option, the current price of the underlying stock, the expected stock price volatility, expected dividend yield, and the risk-free interest rate for the expected
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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)
term of the option. The expected term represents the period of time the stock options are expected to be outstanding. Due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to otherwise estimate the expected term of the stock options, we use the simplified method to estimate the expected term for our stock options. Under the simplified method, the expected term of an option is presumed to be the mid-point between the vesting date and the end of the contractual term. Expected volatility is based on historical volatilities for publicly traded stock of comparable companies over the estimated expected term of the stock options. We assume no dividend yield because dividends are not expected to be paid in the near future, which is consistent with our history of not paying dividends.

In May 2019, our Board of Directors granted a stock option to purchase 700,000 shares of our Class A common stock to our Chief Executive Officer (the "2019 CEO Grant") under the 2017 Plan with an exercise price of $33.98 per share. The 2019 CEO Grant is eligible to vest based on the achievement of a stock price appreciation target of our Class A common stock. Specifically, the 2019 CEO Grant vests when shares of our Class A common stock close at or above $84.63 per share for a period equal to or greater than 90 consecutive calendar days or upon the occurrence of a change in control in which the value of our Class A common stock is equal to or greater than $84.63 per share within five years of the grant date. The fair value of the 2019 CEO Grant was determined using a Monte Carlo simulation. The fair value of the award at the grant date was $9.5 million and is amortized over the derived service period of 2.6 years. Effective February 2021, the 2019 CEO Grant has satisfied all of the conditions required to be considered fully vested. As a result, we accelerated the recognition of approximately $3.3 million in stock-based compensation expense in the nine months ended September 30, 2021.

The following table summarizes stock option activity for the nine months ended September 30, 2021:

Number of Shares