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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| 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 |