Purchased Patents

6 Months Ended

Jun. 30, 2013

Purchased Patents

Purchased Patents

7.  Purchased Patents

In connection with a purchase agreement with Shire Laboratories, Inc., the Company acquired certain patents in 2005. The following sets forth the gross carrying amount and related accumulated amortization of the patents, in thousands:

		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

Amortization expense was approximately $57,000each of the three monthperiods ended June 30, 2013 and 2012 and was approximately $115,000 each of the six month periods ended June 30, 2013 and 2012. The estimated annual aggregate amortization expense through December 31, 2015 is $229,000.  

There were no indicators of impairment identified at June 30, 2013 or December 31, 2012.