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PROPERTY AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | $ 8,151 |  | $ 8,151 |  | $ 5,228
Less: Accumulated depreciation | (3,944) |  | (3,944) |  | (3,232)
Property and equipment, net | 4,207 |  | 4,207 |  | 1,996
Depreciation and amortization expense | 264 | $ 222 | 712 | $ 676 |
Laboratory Equipment [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | 5,885 |  | 5,885 |  | 4,245
Computer Equipment [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | 996 |  | 996 |  | 765
Software [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | 156 |  | 156 |  | 136
Furniture and Fixtures [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | 47 |  | 47 |  | 47
Leasehold Improvements [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | 22 |  | 22 |  | 0
Construction in Process [Member] |  |  |  |  |
Property and Equipment, Net [Abstract] |  |  |  |  |
Property and equipment, gross | $ 1,045 |  | $ 1,045 |  | $ 35

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