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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders Equity Note [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock option activity is as follows:
| Outstanding stock options |
| Number of |  | Weighted average |
| shares |  | exercise price |
Balance at December 31, 2014 |  | 1,528,737 |  | $ | 4.20 |
Options granted |  | 301,500 |  |  | 9.60 |
Options exercised |  | (98,574) |  |  | 2.81 |
Options forfeited |  | (8,555) |  |  | 6.29 |
Options cancelled |  | (556) |  |  | 18.34 |
Balance at December 31, 2015 |  | 1,722,552 |  |  | 5.21 |
Options exercisable at December 31, 2015 |  | 1,238,423 |  |  | 3.72 |
Schedule of Share-based Compensation, Activity [Table Text Block] | The following table summarizes information about stock options outstanding and exercisable at December 31, 2015:
Options outstanding |  | Options exercisable |
Number outstanding |  | Weighted average remaining contractual life (Years) |  | Weighted average exercise price |  | Aggregate intrinsic value |  | Number exerciseable |  | Weighted average remaining contractual life (Years) |  | Weighted average exercise price |  | Aggregate Intrinsic value |
| 1,722,552 |  |  | 6.38 |  | $ | 5.21 |  | $ | 13,363,290 |  |  | 1,238,423 |  |  | 5.31 |  | $ | 3.72 |  | $ | 11,402,022 |
Restricted Stock [Member] |
Stockholders Equity Note [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted common stock activity is as follows:
|  | Number of |
|  | unvested restricted |
|  | shares |
Balance at December 31, 2014 |  |  | 7,000 |
Granted |  |  | - |
Vested |  |  | (4,000) |
Cancelled |  |  | - |
Balance at December 31, 2015 |  |  | 3,000 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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