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Summary of Significant Accounting Policies Accrued Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Accrued Liabilities [Line Items] |  |
Accrued research and development services current | $ 47,721 | $ 29,033
Accrued compensation and benefits current | 6,697 | 9,644
Operating Lease, Liability, Current | 553 | 553
Other Accrued Liabilities, Current | $ 2,367 | $ 2,921

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