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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jul. 16, 2019
May 29, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average grant date fair value of options granted     $ 18.56 $ 10.69  
Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested stock options     $ 17.6   $ 19.5
Weighted-average period of recognition of compensation cost     3 years 1 month   3 years 2 months
Weighted-average remaining contractual term of options outstanding and exercisable     7 years 9 months   7 years 7 months
Restricted Shares Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of recognition of compensation cost     3 years 6 months   3 years 3 months
Unrecognized compensation cost related to unvested RSAs or RSUs     $ 14.9   $ 11.8
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of recognition of compensation cost     1 year 3 months   1 year 6 months
Unrecognized compensation cost related to unvested RSAs or RSUs     $ 3.6   $ 4.3
Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued upon exercise of warrants (shares) 32,529 31,071      
Number of warrants exercised (shares) 40,000 40,000      
Exercise price of warrants (USD per share) $ 7.50 $ 7.50      
Warrants outstanding (shares)     0