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Share-Based Compensation - Share-based Compensation Expense (Details) - Class B Unit Incentive Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense $ 2,675 $ 1,984 $ 2,572
Cost of services      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense 123 100 108
General and administrative      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense 2,425 1,798 2,275
Selling and marketing      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense 81 62 153
Research and development      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense $ 46 $ 24 $ 36