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Stock Warrants (Narrative) (Details) (USD $)
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6 Months Ended | 0 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2013
Minimum [Member]
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Jun. 30, 2013
Maximum [Member]
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Jun. 30, 2013
Weighted Average [Member]
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Jun. 30, 2013
Series HH Warrants [Member]
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Jun. 30, 2013
Five Year Series II Warrants [Member]
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Jun. 30, 2013
Five Year Series II Warrants [Member]
Maximum [Member]
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Jun. 30, 2013
General Electric Capital Corporation [Member]
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Jun. 30, 2013
General Electric Capital Corporation [Member]
Series HH Warrants [Member]
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Jun. 24, 2013
Hercules Technology II, L.P. Notes [Member]
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Jun. 25, 2013
Hercules Technology II, L.P. Notes [Member]
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Jun. 30, 2013
Platinum Montaur Life Sciences, LLC Credit Facility [Member]
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Jun. 30, 2013
Platinum Montaur Life Sciences, LLC Credit Facility [Member]
Maximum [Member]
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Mar. 31, 2013
Platinum Montaur Life Sciences, LLC Credit Facility [Member]
Series X Warrants [Member]
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Jun. 30, 2013
Platinum Montaur Life Sciences, LLC Credit Facility [Member]
Series X Warrants and Series AA Warrants [Member]
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Jun. 30, 2013
Preferred Stock [Member]
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Jun. 30, 2013
Common Stock [Member]
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| Class of Warrant or Right [Line Items] | |||||||||||||||||
| Warrants exercised | 3,000,000 | 7,733,223 | |||||||||||||||
| Issued stock upon exercise of warrants, shares | 3,000,000 | ||||||||||||||||
| Proceeds from warrant exercises | $ 1,380,000 | ||||||||||||||||
| Principal payments on notes payable | 5,901,335 | 1,300,000 | 4,400,000 | 4,781,333 | |||||||||||||
| Number of shares underlying warrant issued | 301,205 | 7,733,223 | |||||||||||||||
| Debt instrument, principal amount | $ 25,000,000 | $ 4,781,333 | $ 35,000,000 | ||||||||||||||
| Warrants outstanding | 1,400,000 | 301,205 | 275,000 | ||||||||||||||
| Exercise price of warrant issued | 1.97 | 3.04 | 2.38 | 2.49 | 3.04 | 2.49 | |||||||||||
| Shares conversion, number of common stock equivalent to each preferred stock | 3,270 | ||||||||||||||||
| Series B preferred stock issued, shares | 2,364.9 | ||||||||||||||||