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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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 six months ended June 30, 2020:
| 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, 2019 | 21,191 |  |  | $ | 2.30 |  |  | 7.4 |  | $ | 312,720 |
Options granted | 1,700 |  |  | $ | 17.93 |  |  |  |  |
Options exercised | (2,618) |  |  | $ | 1.69 |  |  |  |  | $ | 54,791 |
Options canceled/forfeited/expired | (188) |  |  | $ | 2.56 |  |  |  |  |
Balances as of June 30, 2020 | 20,085 |  |  | $ | 3.70 |  |  | 7.4 |  | $ | 647,698 |
Vested and expected to vest as of June 30, 2020 | 20,085 |  |  | $ | 3.70 |  |  | 7.4 |  | $ | 647,698 |
Exercisable as of June 30, 2020 | 18,386 |  |  | $ | 2.39 |  |  | 7.2 |  | $ | 617,064 |
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 periods presented were as follows:
| Six months ended June 30, |  |
| 2020 |  | 2019
Expected term (in years) | 6.0 |  | 6.2
Expected volatility | 40.3 | % |  | 40.3 | %
Risk-free interest rate | 0.7 | % |  | 2.3 | %
Dividend yield | — |  |  | — |
Schedule of Restricted Stock Units Activity | Restricted stock and RSU activity for the six months ended June 30, 2020 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, 2019 | 6,508 |  |  | $ | 11.08 |
Granted - RSUs | 1,987 |  |  | $ | 20.61 |
Granted - Restricted stock | 841 |  |  | $ | 17.06 |
Vested - RSUs | (1,068) |  |  | $ | 10.17 |
Forfeited | (278) |  |  | $ | 11.35 |
Unvested as of June 30, 2020 | 7,990 |  |  | $ | 13.04 |
Vested and not yet released | 9 |  |  | $ | 9.07 |
Outstanding as of June 30, 2020 | 7,999 |  |  | $ | 13.04 |
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:
| Six months ended June 30, |  |
| 2020 |  | 2019
Expected term (in years) | 0.6 |  | N/A
Risk-free interest rate | 1.2 | % |  | N/A
Expected volatility | 45.8 | % |  | N/A
Dividend yield | — |  |  | N/A
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 June 30, |  |  |  | Six Months Ended June 30, |  |  |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  |
| (in thousands) |  |  |  |  |  |  |  |
Cost of revenue | $ | 280 |  |  | $ | 34 |  |  | $ | 547 |  |  | $ | 66 |  |  |
Sales and marketing | 3,608 |  |  | 275 |  |  | 6,771 |  |  | 554 |  |  |
Research and development | 5,374 |  |  | 406 |  |  | 11,464 |  |  | 823 |  |  |
General and administrative | 3,187 |  |  | 329 |  |  | 6,564 |  |  | 658 |  |  |
Total stock-based compensation expense | $ | 12,449 |  |  | $ | 1,044 |  |  | $ | 25,346 |  |  | $ | 2,101 |  |  |

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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