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Fair Value Measurements (Details 3) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in fair value of the financial liabilities |  |  |
Decrease in fair value included in change in fair value of common stock warrants | $ (134,000) | $ (722,000) | $ (516,000)
Significant Unobservable Inputs (Level 3) |  |  |
Changes in fair value of the financial liabilities |  |  |
Balance at beginning of year | 1,301,138 | 2,022,729 |
Decrease in fair value included in change in fair value of common stock warrants | (133,524) | (721,591) |
Balance at end of year | $ 1,167,614 | $ 1,301,138 | $ 2,022,729

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