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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Collaboration revenue | $ 0 | $ 0 | $ 0 | $ 43,000 |
Expiration period (in years) |  |  | 10 years |  |
Asset held for sale |  | 0 |  | 0 | $ 7,000,000
In-process research and development | $ 0 | $ 7,000,000 | $ 0 | $ 7,000,000 |
Minimum |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Award vesting period (in years) |  |  | 1 year |  |
Minimum | Furniture and fixtures |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Useful life (in years) |  |  | 3 years |  |
Minimum | Machinery |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Useful life (in years) |  |  | 5 years |  |
Maximum |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Maximum | Furniture and fixtures |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Useful life (in years) |  |  | 7 years |  |
Maximum | Machinery |  |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |  |
Useful life (in years) |  |  | 7 years |  |

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