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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock-based compensation          
Compensation expense   $ 2,892 $ 2,658 $ 5,121 $ 5,115
Cost of revenue.          
Stock-based compensation          
Compensation expense   112 173 214 284
Sales and marketing          
Stock-based compensation          
Compensation expense   1,224 920 2,251 1,898
Research and development          
Stock-based compensation          
Compensation expense   38 59 121 156
Reimbursement, general and administrative expenses          
Stock-based compensation          
Compensation expense   $ 1,518 1,506 $ 2,535 2,777
2016 Plan          
Stock-based compensation          
Number of shares authorized   4,800,000   4,800,000  
Shares available for future issuance   5,879,162   5,879,162  
Automatic annual increase to the number of shares reserved and available for issuance as a percentage of outstanding common stock (as a percent)   5.00%   5.00%  
Automatic annual increase to the number of shares reserved and available for issuance   2,500,000   2,500,000  
Number of shares of common stock sold 972,591        
Common stock options          
Stock-based compensation          
Compensation expense   $ 600 $ 1,100 $ 1,400 $ 2,300
Unrecognized stock-based compensation          
Unrecognized stock-based compensation expense, period for recognition       1 year 8 months 12 days