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Quarterly Financial Data (unaudited) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Quarterly Financial Data [Abstract] | |||||||||||
| Total revenues | $ 100,000 | $ 0 | $ 0 | $ 0 | $ 100,000 | $ 0 | $ 200,000 | $ 0 | |||
| Net income (loss) | $ (13,439,000) | $ (5,625,000) | $ (15,719,000) | $ 4,665,000 | $ (27,218,000) | $ (9,980,000) | $ (3,423,000) | $ (6,864,000) | $ (30,117,980) | $ (47,485,437) | $ (17,963,873) |
| Basic income (loss) per share applicable to common stock | $ (0.24) | $ (0.10) | $ (0.28) | $ 0.09 | |||||||
| Diluted income (loss) per share applicable to common stock | $ (0.24) | $ (0.10) | $ (0.28) | $ 0.08 | |||||||
| Basic and diluted loss per share applicable to common stock | $ (0.68) | $ (0.33) | $ (0.11) | $ (0.23) | $ (0.55) | $ (1.44) | $ (0.78) | ||||