Consolidated Statements of Stockholders' Deficit - USD ($)	Common Stock Private Placement	Common Stock Subscription Agreements	Common Stock	Preferred Stock Series A Preferred Stock	Preferred Stock Series B Preferred Stock	Treasury Stock	Additional Paid in Capital Private Placement	Additional Paid in Capital Subscription Agreements	Additional Paid in Capital	Equity-based compensation	Foreign currency translation adjustment	Unrealized Pension Actuarial Losses, net of tax	Accumulated Deficit	Private Placement	Subscription Agreements	Series B Preferred Stock	Total
Beginning balance at Dec. 31, 2019			$ 15,000	$ 1,000		$ (10,949,000)			$ 445,452,000	$ 49,337,000	$ (7,329,000)	$ (8,059,000)	$ (1,211,508,000)				$ (743,040,000)
Beginning balance (in shares) at Dec. 31, 2019			2,514,195	4,294,233		46,452
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss													(178,530,000)				(178,530,000)
Equity-based compensation										2,846,000							2,846,000
Foreign currency translation adjustment											(90,000)						(90,000)
Net realized pension actuarial gains, net of tax												(9,005,000)					(9,005,000)
Shares returned in connection with the Appraisal Action following repayment of Margin Loan (in shares)			(76,179)			76,179
Preferred shares converted to Common Stock (in shares)			20,462	(1,004,183)
Settlement gain on related party payable to Ex-Sigma 2 LLC									1,287,000								1,287,000
Common Stock issued for vested RSUs (in shares)			3,587
Adjustment to number of shares withheld in lieu of tax obligation of RSU holders in the year 2018			46			(46)
Ending balance at Dec. 31, 2020			$ 15,000	$ 1,000		$ (10,949,000)			446,739,000	52,183,000	(7,419,000)	(17,064,000)	(1,390,038,000)				(926,532,000)
Ending balance (in shares) at Dec. 31, 2020			2,462,111	3,290,050		122,585
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss													(142,390,000)				(142,390,000)
Equity-based compensation										3,940,000							3,940,000
Foreign currency translation adjustment											(44,000)						(44,000)
Net realized pension actuarial gains, net of tax												6,118,000					6,118,000
Preferred shares converted to Common Stock (in shares)			11,199	(511,939)
Payment for fractional shares on reverse stock split in 2021									(14,000)								(14,000)
Payment for fractional shares on Reverse Stock Split (in shares)			(272)
Issuance of Common Stock	$ 1,000		$ 21,000				$ 25,079,000	$ 530,000	366,519,000					$ 25,080,000	$ 530,000		366,540,000
Issuance of Common Stock (in shares)	486,591	20,188	10,279,931
Ending balance at Dec. 31, 2021			$ 37,000	$ 1,000		$ (10,949,000)			838,853,000	56,123,000	(7,463,000)	(10,946,000)	(1,532,428,000)				(666,772,000)
Ending balance (in shares) at Dec. 31, 2021			13,259,748	2,778,111		122,585
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss													(415,581,000)				(415,581,000)
Equity-based compensation										970,000							970,000
Foreign currency translation adjustment											2,675,000						2,675,000
Net realized pension actuarial gains, net of tax												7,363,000					7,363,000
Common Stock exchanged for Series B Preferred Stock			$ (6,000)						6,000
Common Stock exchanged for Series B Preferred Stock (in shares)			(3,029,900)		3,029,900
Issuance of Common Stock			$ 131,000						266,724,000								266,855,000
Issuance of Common Stock (in shares)			268,701,695
Withholding of employee taxes on vested RSUs										(192,000)							(192,000)
Common Stock issued for vested RSUs (in shares)			56,854
Agreed cancellation of Common Stock issued for Director's vested RSUs (in shares)			(31,082)
Dividend declared and paid on Preferred Stock									(2,532,000)								(2,532,000)
Common Stock repurchased and retired									(487,000)								(487,000)
Common Stock repurchased and retired (in shares)			(357,461)
Reversal of excess withholding of employee taxes on vested RSUs										57,000							57,000
Issuance of Common Stock to Executive Chairman under certain subscription agreement									100,000								100,000
Issuance of Common Stock to Executive Chairman under certain subscription agreement, shares			70,921
Payment for fractional shares Common Stock on Reverse Stock Split in 2022									(45,000)								$ (45,000)
Cancellation of fractional Common Stock on Reverse Stock Split (in shares)			(15,540)
Adjustment to number of shares withheld in lieu of tax obligation of RSU holders in the year 2018																	8,998
Preferred stock converted to Common Stock (in shares)																3,029,900
Ending balance at Dec. 31, 2022			$ 162,000	$ 1,000	$ 3,029,900	$ (10,949,000)			$ 1,102,619,000	$ 56,958,000	$ (4,788,000)	$ (3,583,000)	$ (1,948,009,000)				$ (807,589,000)
Ending balance (in shares) at Dec. 31, 2022			278,655,235	2,778,111		122,585