Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stock-based Compensation - Performance-based stock options (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based compensation          
Stock-based compensation expense $ 773 $ 1,011 $ 2,561 $ 2,739  
Stock Options          
Share-based compensation          
Unrecognized compensation expense related to stock options (in dollars) $ 4,000   $ 4,000    
Stock Options Vesting Based On Performance          
Share-based compensation          
Number of options outstanding, non-vested options 0   0   41,250
Grant date fair value         $ 200
Stock-based compensation expense         $ 200
Unrecognized compensation expense related to stock options (in dollars) $ 0   $ 0