v3.21.2
BASIC AND DILUTED LOSS PER SHARE (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common stock equivalents 3,428 4,548 3,428 4,548
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common stock equivalents 2,975 3,463 2,975 3,463
Unvested Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common stock equivalents 452 716 452 716
Warrant [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common stock equivalents 1 369 1 369