Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory Charges, net (E&O and APC)	$ (15)	$ 2,237	$ 486	$ 2,503
Inventory, Net [Abstract]
Raw materials	19,327		19,327		$ 24,805
Work-in-process	0		0		12
Finished goods	5,040		5,040		5,005
Inventory, Gross	24,367		24,367		29,822
Less: inventory valuation allowance	(9,619)		(9,619)		(9,801)
Inventories, net	14,748		14,748		20,021
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	10,900		$ 10,900		$ 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	157	844	$ 859	1,389
Adverse Purchase Commitments	$ 172	$ (1,393)	$ 373	$ (1,114)