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Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Equity [Abstract] |
Summary of stock option activity |
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |
|  |  |  | Average |  | Remaining |  | Aggregate
|  | Number of |  | Grant Date |  | Contractual |  | Intrinsic
|  | Shares |  | Fair Value |  | Life (Years) |  | Value
|  |  |  |  |  |  |  |  | (In thousands)
Outstanding at December 31, 2019 |  | 15,721,085 |  | $ | 2.44 |  | 8.4 |  | $ | 165,906
Granted |  | 1,375,738 |  |  | 26.56 |  |  |  |  |
Exercised |  | (2,979,700) |  |  | 1.82 |  |  |  |  |
Forfeited |  | (725,582) |  |  | 3.14 |  |  |  |  |
Cancelled |  | (7,240) |  |  | 1.42 |  |  |  |  |
Outstanding at December 31, 2020 |  | 13,384,301 |  | $ | 5.03 |  | 7.7 |  | $ | 500,053
Exercisable at December 31, 2019 |  | 4,349,090 |  | $ | 0.96 |  | 7.4 |  | $ | 52,367
Exercisable at December 31, 2020 |  | 7,343,948 |  | $ | 2.02 |  | 7.1 |  |  | 296,496
Schedule of assumptions used in the option-pricing model for options granted |
|  | Year Ended December 31
|  | 2020 |  | 2019 |  | 2018
Expected term (in years) |  | 5.50 - 6.11 |  | 5.63 - 6.28 |  | 5.38 - 6.10
Risk-free interest rate |  | 0.3% - 1.7% |  | 1.5% - 2.5% |  | 2.6% - 3.1%
Expected volatility |  | 49.2% - 54.7% |  | 48.6% - 49.0% |  | 48.1% - 48.9%
Expected dividend rate |  | — |  | — |  | —
Summary of restricted stock unit activity |
|  |  |  |  | Weighted
|  | Number |  |  | Average
|  | of |  |  | Grant Date
|  | Shares |  |  | Fair Value
Outstanding at December 31, 2019 |  | — |  | $ | —
Granted |  | 558,008 |  | $ | 25.46
Vested |  | (48,096) |  | $ | 26.08
Forfeited |  | (20,845) |  | $ | 23.76
Outstanding at December 31, 2020 |  | 489,067 |  | $ | 25.47
Summary of stock based compensation expense for employees |
|  | Year Ended
|  | December 31
|  | 2020 |  | 2019 |  | 2018
Cost of services |  | $ | 3,056 |  | $ | 537 |  | $ | 96
Selling and marketing |  |  | 2,066 |  |  | 900 |  |  | 366
General and administrative |  |  | 7,699 |  |  | 3,624 |  |  | 2,535
Total stock-based compensation expense |  | $ | 12,821 |  | $ | 5,061 |  | $ | 2,997

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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 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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