Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 52,261	$ 50,571
Accumulated depreciation	(33,387)	(33,229)
Total property, plant and equipment, net	18,874	17,342
Land and Building [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	2,584	2,584
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	29,097	29,870
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,226	3,201
Computer Equipment and Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	7,906	5,444
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 9,448	$ 9,472