Stockholders' Equity (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
The following table summarizes restricted stock unit and award activity for the six months ended June 30, 2018:
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| Share-based Compensation, Stock Options, Activity [Table Text Block] |
The following table summarizes stock option award activity for the six months ended June 30, 2018:
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| Share-based Compensation, Activity [Table Text Block] |
The following table summarizes the warrant activity for the six months ended June 30, 2018:
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