Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Product and service revenue	$ 6,044,689	$ 7,236,766
Research and development contract revenue	400,418	515,376
Total revenue	6,445,107	7,752,142
Cost of product and service revenue	7,998,192	9,060,689
Cost of research and development contract revenue	620,096	765,958
Research and development expense	750,484	1,227,457
Selling, general and administrative expenses	2,881,275	3,935,793
Amortization of intangible assets	573,730	575,773
Operating loss	(6,378,670)	(7,813,528)
Interest and other income	16,212	47,524
Change in fair value of common stock warrant liability	(2,131,314)	1,238,750
Interest and other expense	(82,607)	(55,848)
Net loss	$ (8,576,379)	$ (6,583,102)
Loss per share:
Basic and diluted (in dollars per share)	$ (0.18)	$ (0.28)
Weighted average number of common shares outstanding (in shares)	48,566,794	23,437,600