Financial Statement Details - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Statement Details [Line Items]
Depreciation expense related to property, plant and equipment	$ 1,000,000	$ 100,000	$ 36,000
Property, plant and equipment, gross	20,084,000	5,690,000
Amortization expense	2,600,000	1,300,000	0
Impairment losses on recognized investments	$ 0	0	$ 0
Technology License
Financial Statement Details [Line Items]
Remaining amortization period	2 years 3 months
El Segundo California
Financial Statement Details [Line Items]
Non cash build to suit lease asset	$ 5,100,000
Building Under Build-to-Suit Lease
Financial Statement Details [Line Items]
Property, plant and equipment, gross	4,348,000	$ 0
Building Under Build-to-Suit Lease | Culver City California
Financial Statement Details [Line Items]
Property, plant and equipment, gross	$ 4,300,000