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Balance Sheet Accounts and Supplemental Disclosures - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued compensation | $ 8,623 | $ 9,282
Operating lease liabilities, current | 3,548 | 2,354
Accrued professional service fees | 2,581 | 2,347
Accrued interest, current | 3,864 | 0
Accrued other | 612 | 1,126
Accrued in process research and development | 275 | 1,600
Total accrued expenses | $ 19,503 | $ 16,709

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