Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Options (Details)

v3.20.2
Stock-Based Compensation - Options (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2019
USD ($)
Stock Based Compensation        
Share-based compensation | $ $ 1,757 $ 2,653 $ 3,781 $ 5,606
Additional disclosures        
Shares of common stock available for grant 11,013,055   11,013,055  
Employee stock option        
Stock Based Compensation        
Number of homogenous groups for purposes of determining fair values of options | item     3  
Contractual term of the option     10 years  
Weighted-average assumptions relating to options granted        
Risk-free interest rate (as a percent) 1.10% 2.20% 1.30% 2.50%
Expected term (in years) 6 years 3 months 18 days 6 years 8 months 12 days 6 years 4 months 24 days 6 years 7 months 6 days
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 65.80% 65.00% 65.40% 66.20%
Additional disclosures        
Options granted (in shares)     7,374,090  
Grant-date weighted-average fair value (in dollars per share) | $ / shares     $ 1.39  
Options exercised during the period (in shares)     581,675  
Employee stock option | Vesting upon achievement of corporate performance-based milestones        
Additional disclosures        
Options outstanding 776,250   776,250  
Total unrecognized compensation costs | $ $ 1,200   $ 1,200  
Employee stock option | Consultant        
Stock Based Compensation        
Contractual term of the option     10 years  
Employee stock option | Recipient of performance shares        
Additional disclosures        
Total unrecognized compensation costs | $ $ 14,300   $ 14,300