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Balance Sheet Components - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities Noncurrent [Abstract] |  |
Accrued long-term co-promotion expenses | $ 27,424 | $ 53,071
Other long-term tax liabilities | 8,675 | 8,913
Operating lease liabilities, non-current | 853 | 942
Other | 2,690 | 2,481
Total other long-term liabilities | $ 39,642 | $ 65,407

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