PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 13,276 | $ 13,223 |
| Less: Accumulated depreciation and amortization | (11,749) | (10,786) |
| Property and equipment, net | 1,527 | 2,437 |
| Furniture and office equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 2,733 | 2,680 |
| Laboratory equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 20 | 20 |
| Leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 10,523 | $ 10,523 |