Purchased Patents (Tables)

3 Months Ended

Mar. 31, 2013

Purchased Patents

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

The following sets forth the gross carrying amount and related accumulated amortization of the patents, in thousands:

		March 31, 2013				December 31, 2012
		(unaudited)
	Weighted-	Gross Carrying		Accumulated		Gross Carrying		Accumulated
	Average Life	Amount		Amortization		Amount		Amortization
Purchased patents	10.0	$	2,292	$	1,666	$	2,292	$	1,609