Purchased Patents (Tables)

6 Months Ended

Jun. 30, 2013

Purchased Patents

Schedule of gross carrying amount and related accumulated amortization of the patents

		June 30, 2013					December 31, 2012
		(unaudited)
	Weighted-	Gross Carrying		Accumulated		Gross Carrying		Accumulated
	Average Life	Amount		Amortization		Amount		Amortization
Purchased patents	10.0	$	2,292	$	1,724	$	2,292	$	1,609