Preferred Stock (Tables)

v2.4.1.9

Preferred Stock (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of Preferred Stock Disclosure [Table Text Block]	As of December 31, 2014, the number of convertible preferred shares outstanding is as follows:       December 31, 2014   Series A convertible preferred stock     2,483,692   Series B convertible preferred stock     8,073,508   Series C convertible preferred stock     3,351,156   Series D convertible preferred stock     19,557,392   Total preferred shares     33,465,748