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Other Balance Sheet Details - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Other Balance Sheet Details [Abstract] |  |
Accrued employee related costs | $ 27,341 | $ 24,901
Accounts payable | 13,801 | 5,648
Accrued development costs | 7,069 | 4,799
Other accrued liabilities | 38,166 | 18,172
Total accounts payable and accrued liabilities | $ 86,377 | $ 53,520

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