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Stockholders' Equity - Share Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Additional Disclosure [Abstract]      
Stock-based compensation expense $ 12,821 $ 5,061 $ 2,997
Cost of services      
Share-based Payment Arrangement, Additional Disclosure [Abstract]      
Stock-based compensation expense 3,056 537 96
Selling and marketing      
Share-based Payment Arrangement, Additional Disclosure [Abstract]      
Stock-based compensation expense 2,066 900 366
General and administrative      
Share-based Payment Arrangement, Additional Disclosure [Abstract]      
Stock-based compensation expense $ 7,699 $ 3,624 $ 2,535