Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Product and service revenue	$ 7,201,404	$ 2,620,845	$ 14,438,170	$ 7,614,250
Research and development contract revenue	457,693	1,562,719	973,069	2,347,943
Licensed technology revenue		163,125		326,250
Total revenue	7,659,097	4,346,689	15,411,239	10,288,443
Cost of product and service revenue	8,642,527	4,931,170	17,703,216	11,621,623
Cost of research and development contract revenue	832,564	2,473,516	1,598,522	3,810,596
Research and development expense	1,577,077	1,106,248	2,804,534	2,168,974
Selling, general and administrative expenses	3,567,268	3,882,917	7,503,061	7,444,515
Amortization of intangible assets	572,991	588,473	1,148,764	1,169,962
Operating loss	(7,533,330)	(8,635,635)	(15,346,858)	(15,927,227)
Interest and other income and net realized losses from available-for-sale securities	43,690	87,224	91,214	121,122
Change in fair value of common stock warrant liability	1,053,051	1,790,520	2,291,801	1,790,520
Interest and other expense and foreign currency gain (loss)	(42,965)	5,223	(98,813)	19,717
Net loss	$ (6,479,554)	$ (6,752,668)	$ (13,062,656)	$ (13,995,868)
Loss per share:
Basic and diluted (in dollars per share)	$ (0.17)	$ (0.41)	$ (0.43)	$ (0.95)
Weighted average number of common shares outstanding (in shares)	37,853,358	16,320,235	30,645,479	14,781,215