Stockholders' Equity (Details) (USD $)	0 Months Ended	9 Months Ended		0 Months Ended
	May 29, 2014 class	Sep. 30, 2014	May 29, 2014	May 29, 2014 Minimum series	May 07, 2014 Series C Preferred Stock Automatic conversion, closing of an underwritten public offering Minimum	May 07, 2014 Series B Preferred Stock Automatic conversion, closing of an underwritten public offering Minimum	May 07, 2014 Series A-1 Preferred Stock Automatic conversion, closing of an underwritten public offering Minimum	May 07, 2014 Series A-2 Preferred Stock Automatic conversion, closing of an underwritten public offering Minimum	May 29, 2014 Convertible subordinated promissory notes	May 29, 2014 Convertible subordinated promissory notes Common stock	May 29, 2014 Convertible preferred stock Common stock	May 29, 2014 Initial public offering Common stock
Stockholders' equity
Number of shares issued												9,166,667
Share price (in dollars per share)										$ 6.00		$ 6.00
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs												$ 49,700,000
Number of common shares into which convertible promissory notes were converted										503,450
Number of common shares into which convertible preferred stock was converted											8,809,325
Aggregate principal amount converted									3,000,000
Gross proceeds from underwritten public offering		$ 49,743,641			$ 45,000,000	$ 45,000,000	$ 45,000,000	$ 45,000,000
Authorized shares of preferred stock		10,000,000	10,000,000
Authorized shares of common stock		150,000,000	150,000,000
Number of series of preferred stock that may be issued				1
Number of classes of Board	3
Term of Board member	3 years
Number of classes elected at each annual meeting	1
Affirmative vote of all then-outstanding shares of capital stock for removal of directors (as a percent)				75.00%