Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Product and service revenue	$ 7,129,766	$ 7,201,404	$ 13,174,455	$ 14,438,170
Research and development contract revenue	367,508	457,693	767,926	973,069
Total revenue	7,497,274	7,659,097	13,942,381	15,411,239
Cost of product and service revenue	8,973,308	8,642,527	16,971,500	17,703,216
Cost of research and development contract revenue	532,779	832,564	1,152,875	1,598,522
Research and development expense	823,581	1,577,077	1,574,065	2,804,534
Selling, general and administrative expenses	3,215,425	3,567,268	6,096,700	7,503,061
Amortization of intangible assets	568,291	572,991	1,142,021	1,148,764
Operating loss	(6,616,110)	(7,533,330)	(12,994,780)	(15,346,858)
Interest and other income	40,869	43,690	57,081	91,214
Change in fair value of common stock warrant liability	(5,833,318)	1,053,051	(7,964,632)	2,291,801
Interest and other expense	(146,922)	(42,965)	(229,529)	(98,813)
Gain on sale of equity interest in joint venture	3,234,717		3,234,717
Net loss attributable to the Company	(9,320,764)	(6,479,554)	(17,897,143)	(13,062,656)
Preferred stock dividends declared	(17,303)		(17,303)
Net loss attributable to common shareholders	$ (9,338,067)	$ (6,479,554)	$ (17,914,446)	$ (13,062,656)
Loss per share:
Basic and diluted (in dollars per share)	$ (0.14)	$ (0.17)	$ (0.31)	$ (0.43)
Weighted average number of common shares outstanding (in shares)	68,662,067	37,853,358	58,669,943	30,645,479