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Common Stock (Details Textual) (USD $)
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1 Months Ended | 3 Months Ended | 4 Months Ended | 81 Months Ended | 1 Months Ended | 3 Months Ended | 81 Months Ended | ||
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Apr. 01, 2013
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Mar. 31, 2013
Plans
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May 07, 2013
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Mar. 31, 2013
Plans
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Apr. 29, 2013
Market Issuance Sales Agreement [Member]
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Mar. 31, 2013
Market Issuance Sales Agreement [Member]
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Apr. 01, 2013
Market Issuance Sales Agreement [Member]
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Mar. 31, 2013
Market Issuance Sales Agreement [Member]
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Mar. 31, 2013
Market Issuance Sales Agreement [Member]
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| Common Stock (Textual) [Abstract] | |||||||||
| Public offering of Common Stock, shares | 3,400,000 | 1,565,101 | 1,800,000 | ||||||
| Net proceeds from public offering of Common Stock | $ 11,690,000 | $ 40,743,000 | $ 45,000,000 | $ 11,100,000 | $ 700,000 | $ 11,800,000 | $ 18,100,000 | ||
| Utilization amount | 30,000,000 | ||||||||
| Common Stock (Additional Textual) [Abstract] | |||||||||
| Number of equity compensation plans | 2 | 2 | |||||||
| Stock-based compensation expense related to all unvested stock option | 10,700,000 | 10,700,000 | |||||||
| Stock-based compensation weighted-average vesting period | 1 year 10 months 24 days | ||||||||
| Issuance of common stock | 8,415 | ||||||||
| Issued warrants to purchase common stock | 18,724 | ||||||||
| Warrant exercise price | 4.97 | 4.97 | |||||||
| Proceeds from common stock included in other current assets | $ 700,000 | ||||||||