Intangible Assets and Goodwill (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization:

	September 30, 2012		December 31, 2011
Licenses, patents and purchased technology, net	$	20,056	$	24,054
Acquired IPR&D	628,250		67,550
Intangible assets	$	648,306	$	91,604
Goodwill	$	253,839	$	79,639

Schedule of Goodwill

The following table summarizes the changes in the carrying amount of goodwill: 

Balance at December 31, 2011	$	79,639
Goodwill resulting from the Enobia acquisition	174,200
Balance at September 30, 2012	$	253,839