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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award Options and Warrants Vested and Expected to Vest Outstanding and Exercisable [Table Text Block] | The Black-Scholes assumptions used in the years ended December 31, 2015, 2014 and 2013 are as follows:
|  | Year ended December 31,
|  | 2015 |  | 2014 |  | 2013
Exercise price |  | $ | 1.54 – $2.76 |  |  | $ | 1.46 – $2.91 |  |  | $ | 1.64 – $1.74 |
Expected dividends |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Expected volatility |  |  | 88% – 131% |  |  |  | 101% – 150% |  |  |  | 141% – 154% |
Risk free interest rate |  |  | 1.32% – 2.19% |  |  |  | 1.57% – 2.73% |  |  |  | 0.77% – 2.54% |
Expected life of option |  |  | 5 years – 10 years |  |  |  | 5 years – 10 years |  |  |  | 5 years – 10 years |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock option activities for the years ended December 31, 2015, 2014 and 2013, is as follows:
|  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
Balance – December 31, 2012 |  |  | 4,453,746 |  |  | $ | 1.78 |  |  |  | 6.43 years |  |  | $ | 1,308,000 |
Granted |  |  | 222,500 |  |  | $ | 1.69 |  |  |  |  |  |  |  |  |
Exercised |  |  | (291,666 | ) |  | $ | 0.79 |  |  |  |  |  |  | $ | 71,000 |
Forfeited |  |  | (475,000 | ) |  | $ | 2.30 |  |  |  |  |  |  |  |  |
Balance – December 31, 2013 |  |  | 3,909,580 |  |  | $ | 1.78 |  |  |  | 5.59 years |  |  | $ | 785,000 |
Granted |  |  | 2,382,500 |  |  | $ | 2.36 |  |  |  |  |  |  |  |  |
Exercised |  |  | (6,583 | ) |  | $ | 0.58 |  |  |  |  |  |  | $ | 8,000 |
Forfeited |  |  | (304,391 | ) |  | $ | 1.93 |  |  |  |  |  |  |  |  |
Balance – December 31, 2014 |  |  | 5,981,106 |  |  | $ | 2.01 |  |  |  | 5.80 years |  |  | $ | 685,000 |
Granted |  |  | 3,781,666 |  |  | $ | 2.37 |  |  |  |  |  |  |  |  |
Exercised |  |  | (35,008 | ) |  | $ | 1.16 |  |  |  |  |  |  | $ | 44,000 |
Expired |  |  | (483,332 | ) |  | $ | 2.48 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (302,502 | ) |  | $ | 1.91 |  |  |  |  |  |  |  |  |
Balance – December 31, 2015 – outstanding |  |  | 8,941,930 |  |  | $ | 2.14 |  |  |  | 5.67 years |  |  | $ | 2,900,000 |
Balance – December 31, 2015 – exercisable |  |  | 4,757,754 |  |  | $ | 1.92 |  |  |  | 4.54 years |  |  | $ | 2,272,000 |
Grant date fair value of options granted – 2015 |  |  |  |  |  | $ | 7,974,000 |  |  |  |  |  |  |  |  |
Weighted average grant date fair value – 2015 |  |  |  |  |  | $ | 2.12 |  |  |  |  |  |  |  |  |
Grant date fair value of options granted – 2014 |  |  |  |  |  | $ | 4,974,000 |  |  |  |  |  |  |  |  |
Weighted average grant date fair value – 2014 |  |  |  |  |  | $ | 2.09 |  |  |  |  |  |  |  |  |
Grant date fair value of options granted – 2013 |  |  |  |  |  | $ | 350,000 |  |  |  |  |  |  |  |  |
Weighted average grant date fair value – 2013 |  |  |  |  |  | $ | 1.57 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] | The options outstanding and exercisable at December 31, 2015 are as follows:
|  | Options Outstanding |  | Options Exercisable
|  | Range of Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life
|  | $ | 0.09 – $2.00 |  |  |  | 3,029,938 |  |  | $ | 1.40 |  |  |  | 4.12 years |  |  |  | 2,363,683 |  |  | $ | 1.34 |  |  |  | 3.38 years |
|  | $ | 2.01 – $3.00 |  |  |  | 5,866,168 |  |  |  | 2.50 |  |  |  | 6.50 years |  |  |  | 2,348,247 |  |  |  | 2.44 |  |  |  | 5.76 years |
|  | $ | 3.01 – $6.00 |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 1.62 years |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 1.62 years |
|  | $ | 0.09 – $6.00 |  |  |  | 8,941,930 |  |  | $ | 2.14 |  |  |  | 5.67 years |  |  |  | 4,757,754 |  |  | $ | 1.92 |  |  |  | 4.54 years |
The options outstanding and exercisable at December 31, 2014 are as follows:
|  | Options Outstanding |  | Options Exercisable
|  | Range of Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life
|  | $ | 0.09 – $2.00 |  |  |  | 2,703,280 |  |  | $ | 1.37 |  |  |  | 4.33 years |  |  |  | 2,018,074 |  |  | $ | 1.28 |  |  |  | 3.73 years |
|  | $ | 2.01 – $3.00 |  |  |  | 3,232,002 |  |  |  | 2.49 |  |  |  | 7.08 years |  |  |  | 1,829,298 |  |  |  | 2.40 |  |  |  | 6.73 years |
|  | $ | 3.01 – $6.00 |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 2.62 years |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 2.62 years |
|  | $ | 0.09 – $6.00 |  |  |  | 5,981,106 |  |  | $ | 2.01 |  |  |  | 5.80 years |  |  |  | 3,893,196 |  |  | $ | 1.85 |  |  |  | 5.12 years |
The options outstanding and exercisable at December 31, 2013 are as follows:
|  | Options Outstanding |  | Options Exercisable
|  | Range of Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life
|  | $ | 0.09 – $2.00 |  |  |  | 2,093,196 |  |  | $ | 1.29 |  |  |  | 4.73 years |  |  |  | 1,901,737 |  |  | $ | 1.25 |  |  |  | 4.64 years |
|  | $ | 2.01 – $3.00 |  |  |  | 1,770,560 |  |  |  | 2.28 |  |  |  | 6.65 years |  |  |  | 1,205,976 |  |  |  | 2.26 |  |  |  | 6.25 years |
|  | $ | 3.01 – $6.00 |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 3.62 years |  |  |  | 45,824 |  |  |  | 5.24 |  |  |  | 3.62 years |
|  | $ | 0.09 – $6.00 |  |  |  | 3,909,580 |  |  | $ | 1.78 |  |  |  | 5.59 years |  |  |  | 3,153,537 |  |  | $ | 1.69 |  |  |  | 5.24 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non Vested and Expected to Vest Exercisable [Table Text Block] | The following is a summary of the Company’s non-vested stock options at December 31, 2015:
|  | Unvested Stock Options |  | Weighted Average Grant Date Fair Value
Balance – December 31, 2012 |  |  | 1,561,869 |  |  | $ | 2.11 |
Granted |  |  | 222,500 |  |  | $ | 1.57 |
Vested/Exercised |  |  | (883,882 | ) |  | $ | 1.93 |
Forfeited/Cancelled |  |  | (144,444 | ) |  | $ | 2.27 |
Balance – December 31, 2013 |  |  | 756,043 |  |  | $ | 2.17 |
Granted |  |  | 2,382,500 |  |  | $ | 2.09 |
Vested/Exercised |  |  | (1,050,633 | ) |  | $ | 2.35 |
Balance – December 31, 2014 |  |  | 2,087,910 |  |  | $ | 2.30 |
Granted |  |  | 3,781,666 |  |  | $ | 2.12 |
Vested/Exercised |  |  | (1,382,898 | ) |  | $ | 2.02 |
Forfeited/Cancelled |  |  | (302,502 | ) |  | $ | 1.92 |
Non-vested – December 31, 2015 |  |  | 4,184,176 |  |  | $ | 1.97 |
Weighted average remaining period for vesting |  |  | 2.36 years |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The assumptions used by the Company are summarized in the following table:
|  | Issuance Date |  | December 31, 2014 |  | December 31, 2015
Closing stock price |  |  | $1.75 |  |  |  | $1.46 |  |  |  | $2.29 |
Expected dividends |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Expected volatility |  |  | 95% |  |  |  | 90% |  |  |  | 85% |
Risk free interest rate |  |  | 1.39% |  |  |  | 1.59% |  |  |  | 1.49% |
Expected life of warrant |  |  | 5 years |  |  |  | 4.7 years |  |  |  | 3.79 years |
Schedule Of Estimated Fair Value Of The Warrant Liability [Table Text Block] | The following table summarizes the estimated fair value of the warrant liability (in thousands):
Balance at December 31, 2013 |  | $ | — |
Warrants liability |  |  | 7,376 |
Change in fair value of warrant liability |  |  | (620 | )
Balance at December 31, 2014 |  |  | 6,756 |
Change in fair value of warrant liability |  |  | 3,811 |
Balance at December 31, 2015 |  | $ | 10,567 |
Schedule of Warrant Activity [Table Text Block] | A summary of warrant activity for the Company for the years ended December 31, 2015, 2014 and 2013 is as follows:
|  | Number of Warrants |  | Weighted Average Exercise Price
Balance at December 31, 2012 |  |  | 1,632,501 |  |  | $ | 1.99 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | — |  |  | $ | — |
Forfeited |  |  | — |  |  | $ | — |
Balance at December 31, 2013 |  |  | 1,632,501 |  |  | $ | 1.99 |
Granted |  |  | 7,029,808 |  |  | $ | 1.75 |
Exercised |  |  | (232,619 | ) |  | $ | 1.47 |
Forfeited |  |  | (454,896 | ) |  | $ | 1.88 |
Balance at December 31, 2014 |  |  | 7,974,794 |  |  | $ | 1.80 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | (2,446 | ) |  | $ | 1.60 |
Forfeited |  |  | (63,449 | ) |  | $ | 1.79 |
Balance at December 31, 2015 |  |  | 7,908,899 |  |  | $ | 1.79 |
Schedule of Warrant Outstanding and Exercisable [Table Text Block] | A summary of all outstanding and exercisable warrants as of December 31, 2015 is as follows:
|  | Exercise Price |  | Warrants Outstanding |  | Warrants Exercisable |  | Weighted Average Remaining Contractual Life
|  | $ | 1.60 |  |  |  | 311,834 |  |  |  | 311,834 |  |  |  | 1.82 years |
|  | $ | 1.75 |  |  |  | 7,029,808 |  |  |  | 7,029,808 |  |  |  | 3.78 years |
|  | $ | 2.22 |  |  |  | 517,257 |  |  |  | 517,257 |  |  |  | 0.91 years |
|  | $ | 3.75 |  |  |  | 50,000 |  |  |  | 50,000 |  |  |  | 0.13 years |
|  | $ | 1.79 |  |  |  | 7,908,899 |  |  |  | 7,908,899 |  |  |  | 3.49 years |

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