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Summary of Significant Accounting Policies Accrued Liabilities (Details) - USD ($) | Sep. 30, 2021 | Mar. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accrued Liabilities [Line Items] |  |  |
Accrued research and development services current | $ 7,544,000 |  | $ 21,962,000
Accrued compensation and benefits current | 4,172,000 |  | 6,200,000
Operating Lease, Liability, Current | (1,027,000) |  | (553,000)
Other Accrued Liabilities, Current | 1,465,000 |  | 976,000
Accrued Liabilities | $ 14,208,000 |  | $ 29,691,000
Lexicon incremental borrowing rate |  | 900.00% |

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