Basis of Presentation - Additional Information (Details)		3 Months Ended	12 Months Ended
	May 17, 2017	Mar. 31, 2017	Dec. 31, 2016	May 08, 2017
Series B Preferred Stock
Basis Of Presentation [Line Items]
Cumulative exchangeable redeemable preferred stock dividend rate		10.75%	10.75%
12.5% Senior Secured Notes Due 2017
Basis Of Presentation [Line Items]
Interest rate on Senior secured notes due 2017		12.50%
Senior secured notes, maturity date		Apr. 15, 2017
12.5% Senior Secured Notes Due 2017 | Subsequent Event | Forbearance Agreement
Basis Of Presentation [Line Items]
Interest payment due date	Jun. 15, 2017
12.5% Senior Secured Notes Due 2017 | Subsequent Event | Forbearance Agreement | Minimum
Basis Of Presentation [Line Items]
Percentage of notes covered under agreement				75.10%