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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-Based Compensation Expense Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue |  |  |  |  |  |  |
Subscription and support | $ | 731 |  |  | $ | 426 |  |  | $ | 1,824 |  |  | $ | 1,293 |
Professional services | 407 |  |  | 272 |  |  | 1,183 |  |  | 1,062 |
Operating expenses |  |  |  |  |  |  |
Research and development | 2,347 |  |  | 2,167 |  |  | 7,195 |  |  | 5,790 |
Sales and marketing | 4,095 |  |  | 2,687 |  |  | 10,481 |  |  | 8,367 |
General and administrative | 5,107 |  |  | 5,049 |  |  | 14,679 |  |  | 18,919 |
Total | $ | 12,687 |  |  | $ | 10,601 |  |  | $ | 35,362 |  |  | $ | 35,431 |
Stock Options The following table summarizes the option activity under the Plans for the nine months ended September 30, 2021:
| Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  |
Outstanding at December 31, 2020 | 2,903,167 |  |  | $ | 14.48 |  |  | 4.7 |  |
Granted | — |  |  | — |  |  |  |  |
Forfeited | (6,380) |  |  | 19.25 |  |  |  |  |
Exercised | (629,755) |  |  | 13.96 |  |  |  |  |
Outstanding at September 30, 2021 | 2,267,032 |  |  | $ | 14.61 |  |  | 4.1 |  |
Exercisable at September 30, 2021 | 2,259,753 |  |  | $ | 14.59 |  |  | 4.1 |  |
Restricted Stock Units The following table summarizes the restricted stock unit activity under the Plan for the nine months ended September 30, 2021:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested at December 31, 2020 | 2,904,616 |  |  | $ | 35.72 |
Granted | 872,135 |  |  | 108.00 |
Forfeited | (182,761) |  |  | 63.62 |
Vested(1) | (1,557,830) |  |  | 30.63 |
Unvested at September 30, 2021 | 2,036,160 |  |  | $ | 68.96 |
(1) During the nine months ended September 30, 2021, in accordance with our Nonqualified Deferred Compensation Plan, recipients of 402,832 shares had elected to defer settlement of the vested restricted stock units and 270,567 shares were released from deferral. This resulted in total deferred units of 695,869 as of September 30, 2021. Employee Stock Purchase Plan During the nine months ended September 30, 2021, 148,864 shares of common stock were purchased under the ESPP at a weighted-average price of $59.52 per share, resulting in cash proceeds of $8.9 million. Compensation expense associated with ESPP purchase rights is recognized on a straight-line basis over the vesting period. At September 30, 2021, there was approximately $1.0 million of total unrecognized compensation expense related to the ESPP, which is expected to be recognized over a weighted-average period of 0.3 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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