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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense for Employees and Non-Employees | Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenues | $ | 393 |  |  | $ | 262 |  |  | $ | 1,174 |  |  | $ | 644 |
Research and development | 8,917 |  |  | 8,433 |  |  | 25,976 |  |  | 23,044 |
Sales and marketing | 3,051 |  |  | 2,431 |  |  | 9,625 |  |  | 7,053 |
General and administrative | 12,151 |  |  | 10,403 |  |  | 39,382 |  |  | 28,668 |
Total share-based compensation expense | $ | 24,512 |  |  | $ | 21,529 |  |  | $ | 76,157 |  |  | $ | 59,409 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | The following table summarizes the key assumptions used to determine the fair value of the awards:
Expected term (years) | 3.00 |  |
Expected volatility | 49.04 | % |  |
Expected dividends | — | % |  |
Risk-free interest rate | 0.27 | % |  |
Summary of Restricted Stock Unit Activity | Activity for RSUs and PSUs is as follows:
| RSUs and PSUs Outstanding
| Shares Outstanding |  | Weighted Average Grant Date Fair Value
Balance at December 31, 2020 | 4,816,000 |  |  | $ | 37.82 |
Granted | 2,216,327 |  |  | 86.60 |
Released | (2,391,951) |  |  | 33.81 |
Forfeited | (430,325) |  |  | 44.84 |
Balance at September 30, 2021 | 4,210,051 |  |  | $ | 65.06 |

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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=122041274&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 of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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