Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Performance-based stock options (Details)

v3.20.1
Stock-based Compensation - Performance-based stock options (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based compensation      
Stock-based compensation expense $ 1,788 $ 1,728  
Stock Options      
Share-based compensation      
Unrecognized compensation expense related to stock options (in dollars) $ 4,000    
Stock Options Vesting Based On Performance      
Share-based compensation      
Number of options outstanding, non-vested options 0   41,250
Grant date fair value     $ 200
Stock-based compensation expense     $ 200
Unrecognized compensation expense related to stock options (in dollars) $ 0