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Stock-Based Compensation - Stock options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended 35 Months Ended
May 03, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Mar. 31, 2022
2015 Plan          
Number of Shares          
Outstanding at the beginning (in shares)   4,545,794      
Granted (in shares)   1,455,850      
Exercised (in shares)   (44,165)      
Forfeitures (in shares)   (318,487)      
Outstanding at the end (in shares)   5,638,992   4,545,794 5,638,992
Exercisable at the end (in shares)   2,242,981     2,242,981
Weighted Average Exercise Price          
Outstanding at the beginning (in dollars per share)   $ 14.15      
Granted (in dollars per share)   5.54      
Exercised (in dollars per share)   1.37      
Forfeited (in dollars per share)   12.07      
Outstanding at the end (in dollars per share)   12.16   $ 14.15 $ 12.16
Exercisable at the end (in dollars per share)   $ 13.22     $ 13.22
Weighted Average Remaining Contractual Life (Years) And Aggregate Intrinsic Value          
Outstanding (in years)   8 years 3 months 18 days   8 years 1 month 6 days  
Exercisable at the end (in years)   7 years      
Outstanding at the beginning (in dollars)   $ 2,860      
Outstanding at the end (in dollars)   1,994   $ 2,860 $ 1,994
Exercisable at the end (in dollars)   $ 1,994     1,994
Weighted average grant date fair value per share of stock options granted   $ 3.83      
Aggregate intrinsic value of stock options exercised   $ 200      
Aggregate grant date fair value   3,500 $ 6,400    
Share Based Compensation Expense Not Recognized          
Unrecognized compensation cost   $ 23,800     $ 23,800
Compensation expense recognition period   3 years      
Omnibus Incentive Plan          
Stock Based Compensation          
Annual increase in number of share reserved for issuance (as percent) 4.00%        
2015 Plan and 2019 Employee Stock Purchase Plan          
Stock Based Compensation          
Vesting period   4 years      
Expiration period   10 years      
Number of shares reserved for issuance under the plan   2,283,309     2,283,309
2019 Employee Stock Purchase Plan          
Stock Based Compensation          
Number of shares issued         6,464
Number of shares reserved for issuance under the plan   784,216     784,216