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Stockholders' Equity - Employee Stock Purchase Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Apr. 27, 2016
Stockholders' Equity          
Stock-based compensation expense $ 1,766 $ 2,560 $ 5,597 $ 7,681  
2016 Plan          
Stockholders' Equity          
Shares reserved 5,773,265   5,773,265    
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 1,438,335   1,438,335   1,600,000
Incremental share increase (as a percent)     1.00%    
Incremental share increase (in shares)     500,000    
Stock-based compensation expense $ 100 $ 200 $ 400 $ 700