Earnings Per Share - Anti-dilutive Shares (Details) - $ / shares	1 Months Ended				3 Months Ended		9 Months Ended
	Jan. 31, 2014	May 31, 2013	Feb. 28, 2013	May 31, 2011	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share
Number of dilutive potential common shares							24,563,931	21,932,330
Stock options
Earnings Per Share
Stock options granted					3,312,500	3,270,000	3,592,500	3,920,000
Warrants issued in May, 2011
Earnings Per Share
Number of warrants issued (in shares)				7,128,563
Warrants outstanding (in shares)				22,995,365
Number of warrants unexercised (in shares)							0	192,467
Exercise price of warrants (in dollars per share)				$ 0.93
Warrants issued in February, 2013
Earnings Per Share
Number of warrants issued (in shares)			23,637,500
Number of warrants unexercised (in shares)							100	100
Exercise price of warrants (in dollars per share)			$ 0.15
Warrants issued in January, 2014
Earnings Per Share
Number of warrants issued (in shares)	4,000,000
Number of warrants exercised (in shares)							0	0
Exercise price of warrants (in dollars per share)	$ 4.00
Series C redeemable convertible preferred stock
Earnings Per Share
Stock options granted		10,431
Number of preferred shares that had been converted to common stock							5,200
Stock options
Earnings Per Share
Number of dilutive potential common shares							14,982,570	11,789,611
Restricted stock
Earnings Per Share
Number of dilutive potential common shares							26,667	395,558
Warrants
Earnings Per Share
Number of dilutive potential common shares							4,000,100	4,192,567
Preferred stock
Earnings Per Share
Number of dilutive potential common shares							5,554,594	5,554,594