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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Payables And Accruals [Abstract] |  |
Accrued compensation | $ 9,282 | $ 4,102
Operating lease liabilities, current | 2,354 |
Accrued in process research and development | 1,600 |
Accrued consulting fees | 1,337 | 665
Accrued other | 1,126 | 769
Accrued legal fees | 837 | 1,310
Accrued accounting fees | 173 | 722
Total accrued expenses | $ 16,709 | $ 7,568

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