CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Warrants	Additional Paid-In Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		35,687,000	6,604,000
Beginning balance at Dec. 31, 2018	$ 847,721	$ 36	$ 88,516	$ 1,055,164	$ (295,995)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	1,073			1,073
Issuance of warrants for general unsecured claims (in shares)			1,000
Issuance of warrants for general unsecured claims	0		$ 2	(2)
Net loss	(5,277)				(5,277)
Ending balance (in shares) at Mar. 31, 2019		35,687,000	6,605,000
Ending balance at Mar. 31, 2019	$ 843,460	$ 36	$ 88,518	1,056,235	(301,329)
Beginning balance (in shares) at Dec. 31, 2019	35,772,000	35,772,000	6,659,000
Beginning balance at Dec. 31, 2019	$ 402,452	$ 36	$ 88,520	1,059,253	(745,357)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	185			185
Issuance of common stock for general unsecured claims (in shares)		38,000
Issuance of common stock for general unsecured claims	0
Issuance of warrants for general unsecured claims (in shares)			47,000
Issuance of warrants for general unsecured claims	0
Cash paid for tax withholdings on vested stock awards	(1)			(1)
Net loss	$ (12,670)				(12,670)
Ending balance (in shares) at Mar. 31, 2020	35,810,000	35,810,000	6,706,000
Ending balance at Mar. 31, 2020	$ 389,966	$ 36	$ 88,520	$ 1,059,437	$ (758,027)