Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance Sheet Components [Abstract]
Accrued payroll related costs	$ 56,626	$ 52,854
Accrued manufacturing costs	35,703	14,824
Accrued product development costs	21,201	7,103
Accrued warranty costs	7,415	6,744	$ 4,718
2018	6,113
Accrued professional fees	7,086	6,829
Accrued taxes	794	1,098
Other	5,002	1,499
Total accrued liabilities	$ 133,827	$ 90,951