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 9 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Sep. 30, 2019
USD ($)
Stock Based Compensation        
Share-based compensation | $ $ 1,884 $ 2,098 $ 5,665 $ 7,704
Additional disclosures        
Shares of common stock available for grant 13,989,943   13,989,943  
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) 0.50% 1.70% 1.20% 2.50%
Expected term (in years) 6 years 8 months 12 days 6 years 6 years 6 months 6 years 6 months
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 70.50% 63.00% 66.00% 65.60%
Additional disclosures        
Options granted (in shares)     8,288,090  
Grant-date weighted-average fair value (in dollars per share) | $ / shares     $ 1.41  
Options exercised during the period (in shares)     607,486  
Employee stock option | Vesting upon achievement of corporate performance-based milestones        
Additional disclosures        
Options outstanding 1,101,250   1,101,250  
Total unrecognized compensation costs | $ $ 1,700   $ 1,700  
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 | $ $ 12,600   $ 12,600