Redeemable Preferred Stock - Summary of Cumulative Dividends (Details) - USD ($)		12 Months Ended
		Dec. 31, 2014	Nov. 13, 2014
Temporary Equity [Line Items]
Cumulative dividend accretion at December 31, 2013		$ (19,687,856)
Redeemable Preferred Stock Series C
Temporary Equity [Line Items]
Fair value per Series C share on November 13, 2014 (date of conversion)			$ 166,683,790
Cash proceeds received, net of issuance costs	[1]	(64,341,539)
Cumulative dividend accretion at December 31, 2013		(12,672,925)
Dividend accretion during 2014		(7,014,643)
Loss to common shareholders		$ 82,654,683

[1] Represents the cash proceeds received, net of issuance costs, by the company from Series C investors throughout the life of the security.