Stock Based Compensation (Tables)
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6 Months Ended |
Jun. 30, 2017 |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
The following is a summary of the Company’s stock option activity during the six months ended June 30, 2017: | | | | | | | | | Weighted | | | | | | | | | | | Weighted | | | Average | | | | | | | | | | | Average | | | Remaining | | | | | | | | Number of | | | Exercise | | | Life In | | | Intrinsic | | | | | Options | | | Price | | | Years | | | Value | | | Outstanding at January 1, 2017 | | | 1,309,444 | | | $ | 4.55 | | | | 7.1 | | | $ | 16,107,929 | | | Granted | | | - | | | | - | | | | - | | | | - | | | Exercised | | | (155,478) | | | | 4.68 | | | | - | | | | - | | | Forfeited | | | - | | | | - | | | | - | | | | - | | | Outstanding at June 30, 2017 | | | 1,153,966 | | | $ | 4.53 | | | | 6.7 | | | $ | 13,534,936 | | | | | | | | | | | | | | | | | | | | | Exercisable at January 1, 2017 | | | 1,057,187 | | | $ | 4.55 | | | | 7.1 | | | $ | 12,988,601 | | | Vested | | | 159,134 | | | | 4.53 | | | | - | | | | - | | | Exercised | | | (155,478) | | | | 4.68 | | | | - | | | | - | | | Forfeited | | | - | | | | - | | | | - | | | | - | | | Exercisable at June 30, 2017 | | | 1,060,843 | | | $ | 4.53 | | | | 6.7 | | | $ | 12,440,373 | |
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| Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
A summary of the activity related to RSUs for the six months ended June 30, 2017 is presented below: | | | | | Weighted | | | | | | | Average Grant | | | | | Total | | Date Fair Value | | | Outstanding at January 1, 2017 | | | 2,052,223 | | $ | 11.58 | | | RSUs granted | | | 1,082,383 | | $ | 15.42 | | | RSUs forfeited | | | (57,800) | | $ | 12.91 | | | RSUs vested | | | (281,703) | | $ | 10.44 | | | Outstanding at June 30, 2017 | | | 2,795,103 | | $ | 13.07 | |
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| Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block] |
Grantees of PSUs are required to be employed through December 31, 2018 in order to earn the entire award, if and when vested. No PSUs were granted during the six months ended June 30, 2017. | | | Performance Share Units | | | | | (PSUs) Granted During the | | | | | Six Months Ended | | | | | June 30, 2016 | | | Market capitalization | | $ | 102,600,000 | | | Dividend yield | | | 0 | % | | Expected volatility | | | 75 | % | | Risk-free interest rate | | | 1.04 | % |
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| Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] |
A summary of the activity related to PSUs for the six months ended June 30, 2017 is presented below: | | | | | Weighted | | | | | | | Average Grant | | | | | Total | | Date Fair Value | | | Outstanding at January 1, 2017 | | | 1,153,617 | | $ | 3.66 | | | PSUs granted | | | - | | $ | - | | | PSUs forfeited | | | - | | $ | - | | | PSUs vested | | | - | | $ | - | | | Outstanding at June 30, 2017 | | | 1,153,617 | | $ | 3.66 | |
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| Share Based Compensation Deferred Stock Units Activity [Table Text Block] |
A summary of the activity related to DSUs for the six months ended June 30, 2017 is presented below: | | | | | Weighted | | | | | | | Average Grant | | | | | Total | | Date Fair Value | | | Outstanding at January 1, 2017 | | | 14,953 | | $ | 8.36 | | | DSUs granted | | | - | | $ | - | | | DSUs forfeited | | | - | | $ | - | | | DSUs vested | | | 14,953 | | $ | 8.36 | | | Outstanding at June 30, 2017 | | | - | | $ | - | |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
The fair values of stock options granted were estimated using the following assumptions: | | | Six Months Ended June 30, 2017 | | | Six Months Ended June 30, 2016 | | | Stock price | | $ | 17.59 | | | $ | 8.36 | | | Dividend yield | | | 0 | % | | | 0 | % | | Expected volatility | | | 66 | % | | | 56 | % | | Risk-free interest rate | | | 0.62 | % | | | 0.49 | % | | Expected life | | | 6 months | | | | 6 months | |
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| Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
The following tables summarize total stock-based compensation costs recognized for the three and six months ended June 30, 2017 and 2016: | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | | | 2017 | | 2016 | | 2017 | | 2016 | | | Stock options | | $ | 265,599 | | $ | 123,235 | | $ | 491,982 | | $ | 546,297 | | | RSUs | | | 3,419,390 | | | 1,149,003 | | | 6,022,165 | | | 2,372,099 | | | PSUs | | | 587,433 | | | 228,664 | | | 1,201,293 | | | 443,129 | | | ESPP | | | 93,541 | | | 59,779 | | | 187,352 | | | 122,716 | | | DSUs | | | - | | | 30,996 | | | 1,362 | | | 60,970 | | | Total | | $ | 4,365,963 | | $ | 1,591,677 | | $ | 7,904,154 | | $ | 3,545,211 | |
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| Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |
The total amount of stock-based compensation was reflected within the statements of operations as: | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | | | 2017 | | 2016 | | 2017 | | 2016 | | | Research and development | | $ | 2,326,720 | | $ | 757,250 | | $ | 4,084,622 | | $ | 1,668,093 | | | Sales and marketing | | | 279,015 | | | 68,452 | | | 500,848 | | | 124,769 | | | General and administrative | | | 1,760,228 | | | 765,975 | | | 3,318,684 | | | 1,752,349 | | | Total | | $ | 4,365,963 | | $ | 1,591,677 | | $ | 7,904,154 | | $ | 3,545,211 | |
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