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Stockholders' Equity - Employee Stock Purchase Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Apr. 27, 2017
Stockholders' Equity          
Stock-based compensation expense $ 2,892 $ 2,658 $ 5,121 $ 5,115  
Employee Stock Purchase Plan          
Stockholders' Equity          
Purchase price of common stock under plan (as a percent)     85.00%    
Offering period (in months)     6 months    
Shares reserved 1,623,486   1,623,486   1,600,000
Incremental share increase (in shares)     500,000    
Incremental share increase (as a percent)     1.00%    
Increase in number of shares reserved and available for issuance     194,518    
Stock-based compensation expense $ 400 $ 200 $ 600 $ 400