Warrant	12 Months Ended
Dec. 31, 2016
Equity [Abstract]
Warrant Disclosure [Text Block]	8. Warrant In 2007, the Company issued a warrant as consideration in connection with, among other things, its loan commitment from General Electric Capital Corporation to purchase Series C-3 convertible preferred stock, maturing on December 31, 2017. Upon closing of the initial public offering, this warrant was converted to a warrant to purchase 34,647 shares of common stock at an exercise price of $8.12 per share and was reclassified to stockholders’ equity. During 2015, General Electric Capital Corporation transferred its outstanding warrant to Healthcare Equity Holdings, LLC.

Warrant

12 Months Ended

Dec. 31, 2016

8. Warrant

In 2007, the Company issued a warrant as consideration in connection with, among other things, its loan commitment from General Electric Capital Corporation to purchase Series C-3 convertible preferred stock, maturing on December 31, 2017. Upon closing of the initial public offering, this warrant was converted to a warrant to purchase 34,647 shares of common stock at an exercise price of $8.12 per share and was reclassified to stockholders’ equity. During 2015, General Electric Capital Corporation transferred its outstanding warrant to Healthcare Equity Holdings, LLC.