Other Balance Sheet Components - Summary of Accrued Expenses And Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Balance Sheet Components [Abstract]
General accrued expenses	$ 94,731	$ 41,699
Operating lease liabilities—short-term	45,340	0
Other current liabilities	42,013	23,693
Total accrued expenses and other current liabilities	$ 182,084	$ 65,392