Consolidated Statements of Stockholders' (Deficit) Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative effect from adoption of the new lease standard (Leases: Topic 842)	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative effect from adoption of the new lease standard (Leases: Topic 842)	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2018			3,803	0
Beginning Balance at Dec. 31, 2018	$ (9,361)	$ 246	$ 38	$ 0	$ 55,421	$ (50,472)	$ 246	$ (14,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(28,503)					(28,503)
Foreign currency translation adjustments, net of tax	(1,811)							(1,811)
Change in unrecognized pension and postretirement benefit costs, net of $0 tax effect	69							69
Reclassification to equity of interest paid in kind attributable to conversion option, net of $961 tax effect	2,735				2,735
Share-based compensation	1,143				1,143
Vesting of restricted shares and other (in shares)			15	168
Vesting of restricted shares and other	(101)			$ 454	555
Ending Balance (in shares) at Sep. 30, 2019			3,818	168
Ending Balance at Sep. 30, 2019	(35,381)		$ 38	$ (454)	59,854	(78,729)		(16,090)
Beginning Balance (in shares) at Jun. 30, 2019			3,818	168
Beginning Balance at Jun. 30, 2019	(23,438)		$ 38	$ (454)	58,556	(66,533)		(15,045)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12,196)					(12,196)
Foreign currency translation adjustments, net of tax	(1,068)							(1,068)
Change in unrecognized pension and postretirement benefit costs, net of $0 tax effect	23							23
Reclassification to equity of interest paid in kind attributable to conversion option, net of $961 tax effect	927				927
Share-based compensation	371				371
Ending Balance (in shares) at Sep. 30, 2019			3,818	168
Ending Balance at Sep. 30, 2019	(35,381)		$ 38	$ (454)	59,854	(78,729)		(16,090)
Beginning Balance (in shares) at Dec. 31, 2019			3,818	168
Beginning Balance at Dec. 31, 2019	(41,070)		$ 38	$ (454)	61,461	(88,741)		(13,374)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(29,838)					(29,838)
Foreign currency translation adjustments, net of tax	372							372
Change in unrecognized pension and postretirement benefit costs, net of $0 tax effect	75							75
Reclassification to equity of interest paid in kind attributable to conversion option, net of $961 tax effect	604				604
Reclassification of conversion option to equity, net of $0 tax effect (Note 8)	36,952				36,952
Common shares issued upon conversion of debt (Note 6) (in shares)			70,261
Conversion of debt (Note 6)	(25,309)		$ (703)		(24,606)
Share-based compensation	585				585
Vesting of restricted shares and other	250				(250)
Ending Balance (in shares) at Sep. 30, 2020			74,079	168
Ending Balance at Sep. 30, 2020	(7,261)		$ 741	$ (454)	123,958	(118,579)		(12,927)
Beginning Balance (in shares) at Jun. 30, 2020			74,079	168
Beginning Balance at Jun. 30, 2020	5,726		$ 741	$ (454)	123,510	(103,835)		(14,236)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14,744)					(14,744)
Foreign currency translation adjustments, net of tax	1,284							1,284
Change in unrecognized pension and postretirement benefit costs, net of $0 tax effect	25							25
Reclassification to equity of interest paid in kind attributable to conversion option, net of $961 tax effect	299				299
Share-based compensation	149				149
Ending Balance (in shares) at Sep. 30, 2020			74,079	168
Ending Balance at Sep. 30, 2020	$ (7,261)		$ 741	$ (454)	$ 123,958	$ (118,579)		$ (12,927)