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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Stock Option
​ |  | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Average | ​ | Contractual Life | ​ | Aggregate
​ |  | Options |  | Exercise Price |  | (Years) |  | Intrinsic Value
Outstanding as of January 1, 2021 |  | 14,713 | ​ | $ | 4.47 |  | 7.79 | ​ | $ | 181,914
Options granted |  | 2,677 | ​ | ​ | 31.15 |  | — | ​ |  | —
Options exercised |  | (4,788) | ​ | ​ | 2.62 |  | — | ​ |  | —
Options forfeited |  | (485) | ​ | ​ | 11.01 |  | — | ​ |  | —
Outstanding as of December 31, 2021 |  | 12,117 | ​ | $ | 10.84 |  | 7.53 | ​ | $ | 274,684
Options expected to vest as of December 31, 2021 |  | 4,576 | ​ | $ | 19.70 |  | 9.00 | ​ | $ | 64,265
Options exercisable as of December 31, 2021 |  | 7,077 | ​ | $ | 4.18 |  | 6.49 | ​ | $ | 206,060
Schedule of Black-Scholes-Merton option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Risk‑free interest rate (percentage) |  | 0.6. - 1.4 |  | 0.3 - 1.6 |  | 1.6 - 2.6
Expected term (years) |  | 5.8 - 6.1 |  | 5.3 - 6.3 |  | 5.6 - 6.1
Expected dividend yield (percentage) |  | — |  | — |  | —
Expected volatility (percentage) |  | 42.1 - 43.6 |  | 39.9 - 44.1 |  | 35.4 - 40.9
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restricted Stock
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average Grant
​ | ​ | Number of | ​ | Date Fair
​ |  | Shares |  | Value
Outstanding as of January 1, 2021 | ​ | 1,261 | ​ | $ | 7.74
Granted | ​ | 2,406 | ​ | ​ | 31.22
Vested | ​ | (366) | ​ | ​ | 12.11
Forfeited | ​ | (51) | ​ | ​ | 35.38
Outstanding as of December 31, 2021 |  | 3,250 | ​ | $ | 24.20
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) |  | 2021 |  | 2020 |  | 2019
Cost of revenue | ​ | $ | — | ​ | $ | — | ​ | $ | 8
Product development | ​ |  | 4,369 | ​ |  | 673 | ​ |  | 305
Sales, marketing and customer support | ​ |  | 6,375 | ​ |  | 6,151 | ​ |  | 450
General and administrative | ​ |  | 11,143 | ​ |  | 13,703 | ​ |  | 917
Total stock‑based compensation | ​ | $ | 21,887 | ​ | $ | 20,527 | ​ | $ | 1,680
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non‑cash stock‑based compensation expense | ​ | $ | 21,887 | ​ | $ | 5,984 | ​ | $ | 1,680
Cash‑based compensation expense (a) | ​ |  | — | ​ |  | 14,543 | ​ |  | —
Total stock‑based compensation | ​ | $ | 21,887 | ​ | $ | 20,527 | ​ | $ | 1,680
(a) | Includes incremental cash-based compensation paid in connection with repurchased and cancelled stock options of 956 that contain both market-based and performance-based vesting conditions.

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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 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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