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Debt (Details Textual) (USD $)
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3 Months Ended | 9 Months Ended | 75 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | |||||
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Sep. 30, 2012
Installment
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Aug. 28, 2012
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Sep. 30, 2012
Paramount capital partners note [Member]
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Sep. 24, 2012
Paramount capital partners note [Member]
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Aug. 31, 2012
Hercules debt agreement [Member]
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Sep. 30, 2012
Hercules debt agreement [Member]
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Sep. 30, 2012
Hercules debt agreement [Member]
Installment
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Sep. 30, 2012
Hercules debt agreement [Member]
Estimate of fair value, fair value disclosure [Member]
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Sep. 30, 2012
Hercules debt agreement [Member]
Warrants [Member]
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| Debt (Textual) [Abstract] | |||||||||||||
| Term loan | $ 15,000,000 | ||||||||||||
| Received net proceeds | 14,700,000 | ||||||||||||
| Interest rate | interest at a rate per annum equal to the greater of (i) 9.25% or (ii) 9.25% plus the sum of the prevailing prime rate minus 3.25% | ||||||||||||
| Loan bears interest at a rate per annum | 9.25% | 9.25% | |||||||||||
| Deduction rate on loan bears interest at a rate per annum | 3.25% | 3.25% | |||||||||||
| Maturity Date | Mar. 01, 2016 | ||||||||||||
| Interest payment term | interest-only payments for the initial 12 months and thereafter repay the principal balance of the loan with interest in 30 monthly installments. | ||||||||||||
| No. of Loan repayment installments after 12 month | 30 | ||||||||||||
| Number of Loan repayment consists of interest installments before 12 month | 12 | ||||||||||||
| Subsequent private placement | 2,000,000 | ||||||||||||
| Warrant period | 7 years | ||||||||||||
| Warrant to purchase common stock | 73,009 | 73,009 | |||||||||||
| Warrant exercise price | 5.65 | 5.65 | 5.65 | ||||||||||
| Fair value of the warrant contractual term | 7 years | ||||||||||||
| Fair value of the warrant volatility | 87.20% | ||||||||||||
| Fair value of risk-free interest rate | 1.10% | ||||||||||||
| Dividend yield | 0.00% | ||||||||||||
| Approximate fair value of the warrant | 14,800,000 | 14,800,000 | 14,800,000 | 323,000 | |||||||||
| Charges on termination of the loan stated percentage | 26.50% | ||||||||||||
| Charges on termination of the loan, amount | 398,000 | 398,000 | |||||||||||
| Fees related to the loan agreement | 218,000 | ||||||||||||
| Total amortize loan discounts | 939,000 | ||||||||||||
| Interest rate for amortize loan discounts | 12.30% | ||||||||||||
| Interest expense related to the Hercules loan | 183,000 | 19,000 | 220,000 | 55,000 | 3,504,000 | 164,000 | 164,000 | ||||||
| Paid off to its related party | 767,500 | ||||||||||||
| Interest expenses for the quarter | 17,500 | ||||||||||||
| Repaid the principal amount of accrued interest | $ 750,000 | ||||||||||||