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 |