Balance Sheet Details (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 105,459	$ 94,375
Less accumulated depreciation and amortization	(77,415)	(68,255)
Total property and equipment, net	28,044	26,120
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	67,963	62,583
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,436	10,071
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	21,599	20,320
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,461	$ 1,401