Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Land and building	$ 2,584	$ 2,584
Machinery and equipment	29,870	23,493
Furniture and fixtures	3,201	2,699
Computer equipment and software	5,444	5,204
Leasehold improvements	9,472	8,116
Property, plant and equipment, gross	50,571	42,096
Accumulated depreciation	(33,229)	(30,238)
Total property, plant and equipment, net	$ 17,342	$ 11,858