Balance Sheet Components - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Accrued payroll and benefits	$ 103,004	$ 79,214
Accrued expenses	27,318	21,811
Accrued income taxes	12,405	4,210
Accrued sales rebate	11,209	10,342
Accrued professional fees	6,316	3,604
Accrued warranty	5,929	3,841
Accrued sales tax and value added tax	5,503	5,032
Other accrued liabilities	22,514	6,278
Total current accrued liabilities	$ 194,198	$ 134,332