Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Product and service revenue	$ 7,236,766	$ 4,993,405
Research and development contract revenue	515,376	785,224
Licensed technology revenue		163,125
Total revenue	7,752,142	5,941,754
Cost of product and service revenue	9,060,689	6,690,453
Cost of research and development contract revenue	765,958	1,337,080
Research and development expense	1,227,457	1,062,726
Selling, general and administrative expenses	3,935,793	3,561,598
Amortization of intangible assets	575,773	581,489
Operating loss	(7,813,528)	(7,291,592)
Interest and other income and net realized losses from available-for-sale securities	47,524	33,898
Change in fair value of common stock warrant liability	1,238,750
Interest and other expense and foreign currency gain (loss)	(55,848)	14,494
Net loss	$ (6,583,102)	$ (7,243,200)
Loss per share:
Basic and diluted (in dollars per share)	$ (0.28)	$ (0.55)
Weighted average number of common shares outstanding (in shares)	23,437,600	13,225,095