Subsequent Event (Details) (7.50% Convertible Senior Secured Notes due 2019, USD $) In Thousands, except Share data, unless otherwise specified	8 Months Ended	12 Months Ended	14 Months Ended	2 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Mar. 11, 2015
Subsequent events
Principal amount of the Notes converted	$ 40,492	$ 13,449	$ 53,900
Shares of common stock issued in conversion of Notes and accrued interest thereon	7,600,000	2,500,000	10,178,953
Shares of common stock issued in settlement of the interest make-whole provision	1,300,000	400,000	1,696,366
Subsequent Event
Subsequent events
Principal amount of the Notes converted				$ 12,600
Shares of common stock issued in conversion of Notes and accrued interest thereon				2,400,000
Shares of common stock issued in settlement of the interest make-whole provision				300,000