Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 51,036	$ 51,319
Less: accumulated depreciation and amortization	(44,323)	(45,185)
Property and equipment, net	6,713	6,134
Depreciation	4,500	5,600	$ 7,000
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,982	22,049
Office equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,090	25,087
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,964	$ 4,183