Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Other Benefit Plans (Stock Option Activity) (Details)

v3.20.1
Stock-Based Compensation and Other Benefit Plans (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation and Other Benefit Plans [Abstract]      
Number of Shares Underlying Options, Outstanding at January 1, 2019 2,601    
Number of Shares Underlying Options, Granted 923    
Number of Shares Underlying Options, Exercised (260)    
Number of Shares Underlying Options, Unvested shares forfeited (306)    
Number of Shares Underlying Options, Vested shares expired (124)    
Number of Shares Underlying Options, Outstanding at December 31, 2019 2,834 2,601  
Number of Shares Underlying Options, Exercisable at December 31, 2019 1,858    
Weighted Average Exercise Price Per Share, Outstanding at January 1, 2019 $ 1.54    
Weighted Average Exercise Price Per Share, Granted 2.08 $ 1.05 $ 0.99
Weighted Average Exercise Price Per Share, Exercised 0.99    
Weighted Average Exercise Price Per Share, Unvested shares forfeited 1.50    
Weighted Average Exercise Price Per Share, Vested shares expired 6.70    
Weighted Average Exercise Price Per Share, Outstanding at September 30, 2019 1.55 $ 1.54  
Weighted Average Exercise Price Per Share, Exercisable at September 30, 2019 $ 1.46    
Weighted Average Remaining Contractual Term, Outstanding at September 30, 2019 2 years 9 months 7 days    
Weighted Average Remaining Contractual Term, Exercisable at September 30, 2019 2 years 4 months 2 days    
Aggregate Intrinsic Value, Outstanding at September 30, 2019 $ 2,301    
Aggregate Intrinsic Value, Exercisable at September 30, 2019 $ 1,736