Inventories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory Charges, net (E&O and APC)	$ 501	$ 266
Inventory, Net [Abstract]
Raw materials	16,917		$ 24,805
Work-in-process	0		12
Finished goods	3,924		5,005
Inventory, Gross	20,841		29,822
Less: inventory valuation allowance	(9,996)		(9,801)
Inventories, net	10,845		20,021
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	$ 11,600		11,800
Age of consignment inventory purchased by contract manufacturer	365 days
Age of consignment inventory purchased as a result of forecasted demand	180 days
Inventory Charges, Inventory Valuation, Deposit And Adverse Purchase Commitment Liability	$ 702	545
Adverse Purchase Commitments	201	$ 279
Inventory for Long-term Contracts or Programs, Gross	$ 11,600		$ 11,800