Inventories (Tables)

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	June 30, 2017			December 31, 2016
Raw materials	$	19,327		$	24,805
Work-in-process	—			12
Finished goods	5,040			5,005
	24,367			29,822
Less: inventory valuation allowance	(9,619		)	(9,801		)
Inventories, net	$	14,748		$	20,021

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,
	2017			2016		2017		2016
Inventory, net	$	(15	)	$	2,237	$	486	$	2,503
Adverse purchase commitments(A)	172			(1,393)		373		(1,114)
Net charges	$	157		$	844	$	859	$	1,389

(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.