Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	June 30, 2018			December 31, 2017
Raw materials	$	24,535		$	23,269
Finished goods	2,712			4,012
	27,247			27,281
Less: inventory valuation allowance	(23,434		)	(23,016		)
Inventories, net	$	3,813		$	4,265

Charges Associated with Inventory [Table Text Block]

The Company recorded the following charges associated with the valuation of inventory and the adverse purchase commitment liabilities (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Inventory, net	$	1,627		$	(15	)	$	2,288		$	486
Adverse purchase commitments(A)	(1,669)			172			(2,662)			373
Net charges	$	(42	)	$	157		$	(374	)	$	859

(A) When the Company takes possession of inventory reserved for under the adverse purchase liability (Note 7 — Commitments and Contingencies), the associated liability is transferred from other accrued liabilities to the excess and obsolete inventory valuation allowance.