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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Awards | The following table summarizes the stock options activity under the 2010 Plan and 2019 Plan for the three months ended March 31, 2021:
| Stock Options Outstanding
| (in thousands, except year and per share data)
| Shares Subject to Options Outstanding |  | Weighted- Average Exercise Price per Option |  | Weighted- Average Remaining Contractual Terms (in years) |  | Aggregate Intrinsic Value
Balances as of December 31, 2020 | 18,186 |  |  | $ | 3.92 |  |  | 7.0 |  | $ | 1,310,650 |
Options granted | — |  |  | $ | — |  |  |  |  |
Options exercised | (1,282) |  |  | $ | 6.25 |  |  |  |  | $ | 93,204 |
Options canceled/forfeited/expired | (71) |  |  | $ | 2.73 |  |  |  |  |
Balances as of March 31, 2021 | 16,833 |  |  | $ | 3.75 |  |  | 6.7 |  | $ | 1,119,535 |
Vested and expected to vest as of March 31, 2021 | 16,813 |  |  | $ | 3.75 |  |  | 6.7 |  | $ | 1,118,271 |
Exercisable as of March 31, 2021 | 15,555 |  |  | $ | 2.58 |  |  | 6.5 |  | $ | 1,052,717 |
Schedule of Assumptions Used to Determine the Fair Value of Stock Options Granted | The weighted-average assumptions used to determine the fair value of stock options granted during the three months ended March 31, 2020 were as follows:
|  |  | Three Months ended March 31,
|  |  | 2020
Expected term (in years) |  |  | 6.1
Expected volatility |  |  | 40.0 | %
Risk-free interest rate |  |  | 1.5 | %
Dividend yield |  |  | — |
Schedule of Restricted Stock Units Activity | RSU and restricted stock activity for the three months ended March 31, 2021 was as follows:
| Restricted Stock and RSUs |  | Weighted-Average Grant Date Fair Value
| (in thousands, except per share data)
Unvested and outstanding as of December 31, 2020 | 8,629 |  |  | $ | 21.38 |
Granted - RSUs | 637 |  |  | $ | 82.58 |
Granted - Restricted stock | — |  |  | $ | — |
Vested - RSUs | (649) |  |  | $ | 15.32 |
Vested - Restricted stock | — |  |  | $ | — |
Forfeited | (170) |  |  | $ | 25.78 |
Unvested as of March 31, 2021 | 8,447 |  |  | $ | 26.52 |
Vested and not yet released |  |  |
Outstanding as of March 31, 2021 | 8,447 |  |  |
Schedule of Fair Value Assumptions for Employee Stock Purchase Plan | The weighted-average assumptions used to determine the fair value of the ESPP during the periods presented were as follows:
| Three Months ended March 31,
| 2021 |  | 2020
Expected term (in years) | 0.5 |  | 0.6
Risk-free interest rate | 0.1 | % |  | 1.8 | %
Expected volatility | 59.7 | % |  | 35.5 | %
Dividend yield | — |  |  | — | %
Schedule of Stock-based Compensation Expense | The following table sets forth the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations:
| Three Months Ended March 31, |  |  |  |
| 2021 |  | 2020 |  |  |  |  |  |
| (in thousands) |  |
Cost of revenue | $ | 414 |  |  | $ | 267 |  |  |  |  |  |  |
Sales and marketing | 5,645 |  |  | 3,163 |  |  |  |  |  |  |
Research and development | 8,364 |  |  | 6,090 |  |  |  |  |  |  |
General and administrative | 3,615 |  |  | 3,377 |  |  |  |  |  |  |
Total stock-based compensation expense | $ | 18,038 |  |  | $ | 12,897 |  |  |  |  |  |  |

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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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