Post-effective amendment to a registration statement that is not immediately effective upon filing

NET LOSS PER SHARE - Antidilutive securities excluded from computation of earnings per share (Details)

v3.21.1
NET LOSS PER SHARE - Antidilutive securities excluded from computation of earnings per share (Details) - shares
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded 20,520,000 16,684,000 47,376 24,293
Common Stock options outstanding        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded 19,378,000 12,964,000 19,553 18,072
Unvested restricted stock units outstanding        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded 918,000   683  
Unvested restricted stock awards outstanding        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded 224,000 3,142,000 279 5,587
Common Stock warrants outstanding        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded   578,000 25,010 634
Unvested Trine Founder Shares, held in escrow        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded     1,851