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Warrants, stock-based compensation, stock options, restricted stock and restricted stock units - Restricted stock units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Weighted-average grant date fair value per share    
Share-based compensation expense $ 2,109 $ 1,284
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted common stock issued (in shares) 210,074  
Number of restricted stock units    
Unvested restricted common stock at the beginning of the period (in shares) 370,123  
Granted (in shares) 210,074  
Vested (in shares) (45,474)  
Cancelled (in shares) (12,743)  
Unvested restricted common stock at the end of the period (in shares) 521,980  
Weighted-average grant date fair value per share    
Unvested restricted common stock at the beginning of the period (in dollars per share) $ 20.48  
Granted (in dollars per share) 27.36  
Vested (in dollars per share) 18.92  
Cancelled (in dollars per share) 26.89  
Unvested restricted common stock at the end of the period (in dollars per share) $ 23.22  
Share-based compensation expense $ 900 $ 500
Total unrecognized compensation cost related to unvested stock awards $ 11,400  
Period of recognition of unrecognized compensation cost 3 years 26 days  
Restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted common stock issued (in shares) 0  
Number of restricted stock units    
Granted (in shares) 0  
Unvested restricted common stock at the end of the period (in shares) 39,806  
Weighted-average grant date fair value per share    
Unvested restricted common stock at the end of the period (in dollars per share) $ 3.12  
2017 Plan | Restricted stock units | Subject to a four year vesting schedule with 25% vesting on the first anniversary and the remaining vesting ratably on a monthly basis over the remaining three years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted common stock issued (in shares) 191,867  
Vesting period 1 4 years  
Vesting period 2 3 years  
Vesting percentage 1 (as a percent) 25.00%  
Vesting percentage 2 (as a percent) 75.00%  
Number of restricted stock units    
Granted (in shares) 191,867  
2017 Plan | Restricted stock units | Vesting on December 31, 2019    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted common stock issued (in shares) 15,890  
Number of restricted stock units    
Granted (in shares) 15,890  
2017 Plan | Restricted stock units | Vested immediately upon grant    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted common stock issued (in shares) 2,317  
Number of restricted stock units    
Granted (in shares) 2,317