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Other Balance Sheet Details - Summary of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |  |
Accounts payable | $ 6,671 |  | $ 3,355
Accrued research and development expenses | 4,102 |  | 10,999
Accrued professional fees | 1,118 |  | 1,930
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Consolidated Balance Sheet) | 3,214 | $ 1,408 | 0
Deferred rent | 0 |  | 204
Other | 2,451 |  | 4,969
Total accounts payable and accrued liabilities | $ 17,556 |  | $ 21,457

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