Subsequent Events (Details) - 7.50% Convertible Senior Secured Notes due 2019 - USD ($) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Nov. 09, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Subsequent events
Principal amount of the Notes converted		$ 26,335	$ 13,400	$ 53,941
Shares of common stock issued in conversion of Notes and accrued interest thereon		5,000,000
Shares of common stock issued in settlement of the interest make-whole provision		500,000
Subsequent Event
Subsequent events
Principal amount of the Notes converted	$ 1,200
Shares of common stock issued in conversion of Notes and accrued interest thereon	200,000
Shares of common stock issued in settlement of the interest make-whole provision	13,000