Balance Sheet Details (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, net
Property, plant and equipment, gross	$ 141,109	$ 138,647
Less accumulated depreciation and amortization	(86,806)	(80,205)
Property, plant and equipment, net	54,303	58,442
Depreciation expense	13,275	12,965	$ 12,379
Building
Property, plant and equipment, net
Property, plant and equipment, gross	40,320	40,320
Computer software
Property, plant and equipment, net
Property, plant and equipment, gross	18,424	20,922
Computer equipment
Property, plant and equipment, net
Property, plant and equipment, gross	36,607	36,608
Furniture and fixtures
Property, plant and equipment, net
Property, plant and equipment, gross	16,881	15,140
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	10,110	7,176
Machinery
Property, plant and equipment, net
Property, plant and equipment, gross	16,936	17,406
Construction in progress
Property, plant and equipment, net
Property, plant and equipment, gross	$ 1,831	$ 1,075