Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Stock Option Activity (Details)

v3.20.1
Stock-Based Compensation - Stock Option Activity (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Number of shares, beginning outstanding (in shares) 1,465,450  
Number of shares, released (31,506)  
Number of shares, forfeited (52,771)  
Number of shares, ending outstanding (in shares) 1,381,173 1,465,450
Number of shares, exercisable (in shares) 1,033,654  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, beginning outstanding (in dollars per share) $ 0.80  
Weighted average exercise price, released (in dollars per share) 0.47  
Weighted average exercise price, forfeited (in dollars per share) 1.20  
Weighted average exercise price, ending outstanding (in dollars per share) 0.79 $ 0.80
Weighted average exercise price, exercisable (in dollars per share) $ 0.72  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted average remaining contractual term 6 years 4 months 28 days 6 years 10 months 9 days
Weighted average remaining contractual term, exercisable (in years) 5 years 11 months 8 days  
Share-Based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]    
Aggregate intrinsic value $ 115 $ 771
Aggregate intrinsic value, exercisable $ 96