Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands):

	March 31, 2018			December 31, 2017
Raw materials	$	24,037		$	23,269
Finished goods	3,766			4,012
	27,803			27,281
Less: inventory valuation allowance	(23,204		)	(23,016		)
Inventories, net	$	4,599		$	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
	March 31,
	2018			2017
Inventory, net	$	661		$	501
Adverse purchase commitments(A)	(993)			201
Net charges	$	(332	)	$	702

(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.