Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Paid-In Capital	Other Comprehensive Income (Loss)	Accumulated deficit
Beginning balance at Dec. 31, 2017	$ (248,935)	$ 26	$ 1	$ 313,244	$ 278	$ (562,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares	(11)			(11)
Share-based compensation expense	617			617
Issuance of shares under employee stock purchase plan	43			43
Derivative fair value adjustment, net of tax	(1,138)				(1,080)	(58)
Preferred stock dividend	(2,570)					(2,570)
Net income (loss)	(2,253)					(2,253)
Ending balance at Jun. 30, 2018	(254,247)	26	1	313,893	(802)	(567,365)
Beginning balance at Mar. 31, 2018	(251,808)	26	1	313,637	(718)	(564,754)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	256			256
Derivative fair value adjustment, net of tax	(84)				(84)
Preferred stock dividend	(1,285)					(1,285)
Net income (loss)	(1,326)					(1,326)
Ending balance at Jun. 30, 2018	(254,247)	26	1	313,893	(802)	(567,365)
Beginning balance at Dec. 31, 2018	(262,167)	26	1	314,268	0	(576,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares	72,841	92		72,749
Share-based compensation expense	44			44
Net income (loss)	261,727					261,727
Cancellation of Predecessor equity	396	(26)	(1)	(314,312)		314,735
Issuance of Successor common stock upon vesting of restricted stock, net of shares retired for taxes	859	2		857
Ending balance at Feb. 08, 2019	73,700	94	0	73,606	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	1,072			1,072
Net income (loss)	(24)					(24)
Ending balance at Jun. 30, 2019	74,748	94	0	74,678	0	(24)
Beginning balance at Mar. 31, 2019	74,803	94	0	73,972	0	737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	706			706
Net income (loss)	(761)					(761)
Ending balance at Jun. 30, 2019	$ 74,748	$ 94	$ 0	$ 74,678	$ 0	$ (24)