Condensed Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands	Common Stock Private Placement	Common Stock At the Market Offering	Common Stock Subscription Agreements	Common Stock	Preferred Stock	Treasury Stock	Additional Paid in Capital Private Placement	Additional Paid in Capital At the Market Offering	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	At the Market Offering	Subscription Agreements	Total
Beginning balance at Dec. 31, 2018				$ 15	$ 1	$ (10,342)				$ 445,452	$ 41,731	$ (6,423)	$ (9,301)	$ (702,392)				$ (241,259)
Beginning balance (in shares) at Dec. 31, 2018				50,047,653	4,569,233	849,728
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss														(509,116)				(509,116)
Equity-based compensation											7,829							7,829
Foreign currency translation adjustment												(906)						(906)
Net realized pension actuarial gains, net of tax													1,242					1,242
RSU's vested (in shares)				203,494
Common Stock issued for vested RSUs (in shares)				203,494
Withholding of employee taxes on vested RSUs											(223)							(223)
Preferred stock converted to Common Stock (in shares)				112,071	(275,000)
Shares repurchased						$ (607)												(607)
Shares repurchased (in shares)				79,321		(79,321)
Ending balance at Dec. 31, 2019				$ 15	$ 1	$ (10,949)				445,452	49,337	(7,329)	(8,059)	(1,211,508)				(743,040)
Ending balance (in shares) at Dec. 31, 2019				50,283,897	4,294,233	929,049
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss														(178,530)				(178,530)
Equity-based compensation											2,846							2,846
Foreign currency translation adjustment												(90)						(90)
Net realized pension actuarial gains, net of tax													(9,005)					(9,005)
RSU's vested (in shares)				71,747
Common Stock issued for vested RSUs (in shares)				71,747
Shares returned in connection with the Appraisal Action following repayment of Margin Loan (in shares)				(1,523,578)		1,523,578
Preferred stock converted to Common Stock (in shares)				409,238	(1,004,183)
Settlement gain on related party payable to Ex-Sigma 2										1,287								1,287
Shares Paid for Tax Withholding for Share Based Compensation				921		(921)
Ending balance at Dec. 31, 2020				$ 15	$ 1	$ (10,949)				446,739	52,183	(7,419)	(17,064)	(1,390,038)				(926,532)
Ending balance (in shares) at Dec. 31, 2020				49,242,225	3,290,050	2,451,706
Increase (Decrease) in Stockholders' Equity (Deficit)
Net loss														(142,390)				(142,390)
Equity-based compensation											3,940							3,940
Foreign currency translation adjustment												(44)						(44)
Net realized pension actuarial gains, net of tax													6,118					6,118
Preferred stock converted to Common Stock (in shares)				223,977	(511,939)
Payment for fractional shares on Reverse Stock Split										(14)								$ (14)
Payment for fractional shares on Reverse Stock Split (in shares)				(5,445)
Issuance of Common Stock	$ 1	$ 21					$ 25,079	$ 366,519	$ 530						$ 25,080	$ 366,540	$ 530
Issuance of Common Stock (in shares)	9,731,819	205,598,616	403,769
Shares repurchased (in shares)																		929,049
Ending balance at Dec. 31, 2021				$ 37	$ 1	$ (10,949)				$ 838,853	$ 56,123	$ (7,463)	$ (10,946)	$ (1,532,428)				$ (666,772)
Ending balance (in shares) at Dec. 31, 2021				265,194,961	2,778,111	2,451,706