Stockholders' Equity (Deficit) (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 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 year ended December 31, 2018:
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| Share-based Compensation, Stock Options, Activity [Table Text Block] |
The following table summarizes stock option award activity for the year ended December 31, 2018:
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| Share-based Compensation, Activity [Table Text Block] |
The following table summarizes the warrant activity for the year ended December 31, 2018:
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