Net Loss Per Common Share - Reconciliation of Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net loss	$ (33,048)	$ (3,900)	$ (11,172)	$ (6,421)	$ (116,511)	$ 1,718	$ (748)	$ (1,114)	$ (54,541)	$ (116,655)	$ (28,834)
Net loss per common share:
Basic									$ (2.92)	$ (8.43)	$ (3.11)
Diluted									$ (2.92)	$ (8.43)	$ (3.11)
Weighted average common shares outstanding
Basic									18,651,582	13,835,128	9,279,324
Add potentially dilutive securities:
Diluted weighted average common shares outstanding									18,651,582	13,835,128	9,279,324