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Stock-based Compensation | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation | 8. Stock-based Compensation The following table summarizes stock-based compensation expense, which was included in the statements of operations as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30 | ​ | September 30
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of services | ​ | $ | 1,536 | ​ | $ | 818 | ​ | $ | 4,284 | ​ | $ | 1,970
Selling and marketing | ​ | ​ | 917 |  |  | 351 | ​ | ​ | 2,396 | ​ |  | 1,475
General and administrative | ​ | ​ | 4,694 |  |  | 1,902 | ​ | ​ | 12,018 | ​ |  | 5,216
Total stock-based compensation expense | ​ | $ | 7,147 |  | $ | 3,071 | ​ | $ | 18,698 | ​ | $ | 8,661
​

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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