Redeemable Preferred Stock - Additional Information (Details)		3 Months Ended	9 Months Ended
	Nov. 13, 2014 USD ($) shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares shares
Temporary Equity [Line Items]
Common stock share split ratio	0.7396
Dividends accrued | $			$ 0
IPO
Temporary Equity [Line Items]
Debt conversion converted instrument shares issued	11,067,090
Redeemable Preferred Stock Series B
Temporary Equity [Line Items]
Dividends accrued | $		$ 1,242,625		$ 3,594,756
Redeemable Preferred Stock Series B | IPO
Temporary Equity [Line Items]
Redeemed outstanding shares value | $	$ 34,998,957
Preferred Stock Series C
Temporary Equity [Line Items]
Preferred stock, shares issued		0		1,247,808
Preferred stock, shares issued price | $ / shares		$ 5.25	$ 5.25	$ 5.25
Dividends accrued | $		$ 1,654,389		$ 6,149,948
Preferred Stock Series C | IPO
Temporary Equity [Line Items]
Debt conversion converted instrument shares issued	1,832,531
Convertible preferred stock shares issued upon conversion	2,477,756