Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of the following (in thousands):

	March 31, 2013		December 31, 2012
Purchased materials	$	2,061	$	2,081
Work‑in‑process	23		—
Finished goods	8,465		9,648
	$	10,549	$	11,729