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Equity Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Changes in Shares Available for Grant | Changes in shares available for grant during the nine months ended September 30, 2021 were as follows:
|  | Shares Available for Grant |
Shares available for grant at December 31, 2020 |  |  | 18,617,001 |
2019 Equity Incentive Plan reserve increase effective January 1, 2021 |  |  | 6,882,344 |
Options and restricted stock units granted |  |  | (3,295,903 | )
Options and restricted stock units forfeited, cancelled or expired |  |  | 807,623 |
Shares available for grant at September 30, 2021 |  |  | 23,011,065 |
Summary of Stock Option Activity Under 2009 Plan and 2019 Plan | Stock option activity under the 2009 Plan and 2019 Plan during the nine months ended September 30, 2021 was as follows:
|  | Shares Subject to Outstanding Options |  |  | Weighted-Average Exercise Price per Share |  |  | Aggregate Intrinsic Value (in thousands) |
Options outstanding at December 31, 2020 |  |  | 14,433,560 |  |  | $ | 12.82 |  |  | $ | 668,458 |
Options granted |  |  | 2,407,629 |  |  |  | 41.21 |  |  |  |  |
Options forfeited or cancelled |  |  | (744,501 | ) |  |  | 24.48 |  |  |  |  |
Options expired |  |  | (21,452 | ) |  |  | 18.98 |  |  |  |  |
Options exercised |  |  | (3,310,804 | ) |  |  | 7.04 |  |  |  |  |
Options outstanding at September 30, 2021 |  |  | 12,764,432 |  |  | $ | 18.98 |  |  | $ | 218,168 |
Options vested and exercisable at September 30, 2021 |  |  | 7,080,906 |  |  | $ | 10.29 |  |  | $ | 170,535 |
Summary of Restricted Stock Unit Activity | Restricted stock unit activity under the 2019 Plan during the nine months ended September 30, 2021 was as follows:
|  | Restricted Stock Units Outstanding |  |  | Weighted-Average Grant Date Fair Value per Share |
Nonvested outstanding restricted stock units at December 31, 2020 |  |  | 50,000 |  |  | $ | 28.10 |
Restricted stock units granted |  |  | 888,274 |  |  |  | 40.21 |
Restricted stock units forfeited or cancelled |  |  | (41,670 | ) |  |  | 45.06 |
Restricted stock units vested |  |  | (15,625 | ) |  |  | 28.10 |
Nonvested outstanding restricted stock units at September 30, 2021 |  |  | 880,979 |  |  | $ | 39.51 |
Summary of Estimated Grant Date Fair Value of Options Granted | The estimated grant date fair value of options granted during the nine months ended September 30, 2021 and 2020 was estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |
Fair value of common stock |  | $30.86 - $66.50 |  |  | $17.68 - $48.54 |
Expected term (in years) |  | 5.27 - 6.08 |  |  | 5.27 - 6.08 |
Risk-free interest rate |  | 0.5% - 1.1% |  |  | 0.4% - 1.7% |
Expected volatility |  | 67.1% - 70.0% |  |  | 70.5% - 73.0% |
Expected dividend yield |  |  | — |  |  |  | — |
Summary of Compensation Costs Related to Stock Options and RSUs Included on Unaudited Condensed Consolidated Statements of Operations | The compensation costs related to stock options and restricted stock units for the three and nine months ended September 30, 2021 and 2020, respectively, are included on our unaudited condensed consolidated statements of operations as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of revenue |  | $ | 650 |  |  | $ | 206 |  |  | $ | 1,386 |  |  | $ | 587 |
Research and development |  |  | 3,637 |  |  |  | 2,216 |  |  |  | 10,311 |  |  |  | 5,912 |
Sales and marketing |  |  | 3,369 |  |  |  | 1,759 |  |  |  | 9,166 |  |  |  | 4,583 |
General and administrative |  |  | 3,987 |  |  |  | 2,289 |  |  |  | 10,513 |  |  |  | 6,436 |
Total share-based compensation expense |  | $ | 11,643 |  |  | $ | 6,470 |  |  | $ | 31,376 |  |  | $ | 17,518 |

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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 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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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