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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders Equity Note [Abstract] |
Schedule of Warrant Valuation Assumptions [Table Text Block] | The fair value of the Private Placement and Placement Agent warrants were estimated using a Monte Carlo Simulation approach using the following assumptions.
|  | December 31, 2016 |  |  |  | April 14, 2016 |  |
Private Placement Warrants |  |  |  |  |  |  |  |  |  |
Stock Price |  | $ | 2.70 |  |  |  | $ | 4.45 |  |
Exercise Price |  | $ | 4.00 |  |  |  | $ | 4.98 |  |
Remaining term (in years) |  |  | 6.29 |  |  |  |  | 7.00 |  |
Volatility |  |  | 51.40 |  | % |  |  | 46.90 |  | %
Risk-free interest rate |  |  | 2.14 |  | % |  |  | 1.57 |  | %
Expected dividend yield |  | — |  | % |  | — |  | %
Placement Agent Warrants |  |  |  |  |  |  |  |  |  |
Stock Price |  | $ | 2.70 |  |  |  | $ | 4.45 |  |
Exercise Price |  | $ | 3.99 |  |  |  | $ | 3.99 |  |
Remaining term (in years) |  |  | 4.29 |  |  |  |  | 5.00 |  |
Volatility |  |  | 56.10 |  | % |  |  | 49.00 |  | %
Risk-free interest rate |  |  | 1.77 |  | % |  |  | 1.26 |  | %
Expected dividend yield |  | — |  | % |  | — |  | %

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