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Stockholders' Equity (Deficit) (Tables) | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Summary of Preferred Stock Allocated to Investors | The Purchase Agreement provides for the Company to issue and sell to the Investor, upon stockholder approval which was received on June 9, 2015, shares of the Company’s preferred stock in the amounts set forth in the following table (numbers have been adjusted for the February 2016 reverse stock split):
Convertible Preferred Stock |  | Shares |  |  | Price Per Share |  |  | Total Investment |
Series AA-1 |  |  | 8,427,004 |  |  | $ | 12.00 |  |  | $ | 101,124,042 |
Series AA-2 |  |  | 7,223,145 |  |  | $ | 6.00 |  |  |  | 43,338,870 |
|  |  | 15,650,149 |  |  |  |  |  |  | $ | 144,462,912 |
Stock Options Valuation Assumptions | The Black-Scholes option valuation model was developed for estimating the fair value of traded options that have no vesting restrictions and are fully transferable. Because option valuation models require the use of subjective assumptions, changes in or variations from these assumptions can materially affect the fair value of the options.
|  | March 31, 2016 |  |  | March 31, 2015
Risk-free interest rate |  |  | — |  |  | 1.78 - 2.00%
Expected volatility of common stock |  |  | — |  |  | 64.47 - 65.95%
Dividend yield |  |  | — |  |  | 0%
Expected life of options |  |  | — |  |  | 6.1 - 8.2 years

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- Definition Preferred Stock Activity [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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