Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity

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Stockholders' Equity
9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Stockholders Equity Note Disclosure [Text Block]
8. Stockholders’ Equity
 
Common Stock
 
In May and June 2016, 1,072,307 shares of common stock were issued upon the cashless net exercise of 2,016,075 Class A Warrants in accordance with their terms. There were 847,569 Class A Warrants outstanding at September 30, 2017.
 
In May and June 2016, 58,569 shares of common stock were issued upon the cashless net exercise of 114,546 Underwriter Warrants in accordance with their terms. There were no remaining Underwriter Warrants outstanding at September 30, 2017.