Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Inventory, Net [Abstract]
Raw materials	$ 13,688		$ 13,688		$ 23,269
Finished goods	2,134		2,134		4,012
Inventory, Gross	15,822		15,822		27,281
Less: inventory valuation allowance	(13,666)		(13,666)		(23,016)
Inventories, net	2,156		$ 2,156		$ 4,265
Age of consignment inventory purchased as a result of forecasted demand			180 days
Inventory Charges, net (E&O and APC)	250	$ 5,763	$ 2,538	$ 6,249
Adverse Purchase Commitments	100	1,278	(2,562)	1,651
Inventory Charges, Inventory Valuation, Deposit And Adverse Purchase Commitment Liability	$ 350	$ 7,041	$ (24)	$ 7,900