Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory Charges, net (E&O and APC)	$ 5,763	$ 1,570	$ 6,249	$ 4,073
Inventory, Net [Abstract]
Raw materials	21,125		21,125		$ 24,805
Work-in-process	0		0		12
Finished goods	4,589		4,589		5,005
Inventory, Gross	25,714		25,714		29,822
Less: inventory valuation allowance	(14,659)		(14,659)		(9,801)
Inventories, net	11,055		11,055		20,021
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	11,300		$ 11,300		$ 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	7,041	1,281	$ 7,900	2,670
Adverse Purchase Commitments	$ 1,278	$ (289)	$ 1,651	$ (1,403)