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Stock-Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense for restricted stock units (RSUs), performance-based restricted stock units (PSUs), stock options and issuances of common stock pursuant to our employee stock purchase plan was classified in the accompanying consolidated statements of operations as follows:
|  | Three Months Ended March 31,
|  | 2021 |  | 2020
|  | (in thousands)
Stock-based compensation expense: |  |  |  |
Cost of revenue |  | $ | 1,554 |  |  | $ | 931 |
Research and development |  | 7,815 |  |  | 4,645 |
Sales and marketing |  | 5,746 |  |  | 3,678 |
General and administrative |  | 5,747 |  |  | 4,093 |
Total stock-based compensation expense |  | $ | 20,862 |  |  | $ | 13,347 |
Summary of Restricted Stock and Restricted Stock Unit Activity | RSUs and PSUs activity during the three months ended March 31, 2021 was as follows:
|  |  | Shares |  | Weighted-Average Grant Date Fair Value
Unvested balance as of December 31, 2020 |  |  | 2,941,914 |  |  | $ | 45.86 |
Granted |  |  | 1,447,632 |  |  | 88.64 |
Vested |  |  | (374,579) |  |  | 33.20 |
Forfeited |  |  | (61,704) |  |  | 52.67 |
Unvested balance as of March 31, 2021 |  |  | 3,953,263 |  |  | $ | 62.61 |
Summary of Stock Option Activity | Stock option activity during the three months ended March 31, 2021 was as follows:
|  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2020 |  | 1,933,013 |  |  | $ | 10.07 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (170,006) |  |  | 8.34 |  |  |  |  | $ | 12,550 |
Forfeited/cancelled |  | — |  |  | — |  |  |  |  |
Outstanding as of March 31, 2021 |  | 1,763,007 |  |  | $ | 10.24 |  |  | 3.9 |  | $ | 113,492 |
Vested and exercisable as of March 31, 2021 |  | 1,736,419 |  |  | $ | 10.04 |  |  | 3.8 |  | $ | 112,127 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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