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STOCK INCENTIVE PLANS - Stock-based Compensation (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 09, 2021 | Nov. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 14,574 | $ 17,837 | $ 3,487
Software Development |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 600 |  |
Chief Executive Officer |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  | $ 11,100 |  |  |
Cost of revenue, net |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 4,115 | 2,272 | 846
Research and development |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 1,617 | 2,469 | 741
General and administrative |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 7,356 | 12,648 | 1,496
Sales and marketing |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 1,486 | 448 | 404
Secondary sales of common stock |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | 0 | 15,255 | 0
Stock options |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 3,425 | 2,582 | 3,487
Vesting period (years) |  |  |  | 4 years |  |
Restricted stock units |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense | $ 2,900 |  |  | $ 11,149 | $ 0 | $ 0
Vesting period (years) |  |  |  | 8 years |  |
Service period (in years) |  | 1 year |  | 1 year |  |
Restricted stock units | Member of Audit Committee |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 100 |  |
Service period (in years) |  |  |  | 3 years |  |

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