Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2011

Other Current Assets [Abstract]

Other Current Assets

	September 30, 2011		December 31, 2010
Prepaid expenses	$	15,725	$	16,272
Receivable from collaborative partner		14,633		16,628
Other non-trade receivables		2,227		4,003
Other current assets		7,393		8,555
	$	39,978	$	45,458