CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2019	$ 376	$ 134,217	$ (55,731)	$ (15,997)	$ (3,174)	$ 59,691
Balance (in shares) at Dec. 31, 2019	37,612		(5,731)
Net loss attributable to common stockholders				17,282		17,282
Settlement of stock awards	$ 5		$ (700)			(695)
Settlement of stock awards (in shares)	504		(223)
Unrealized gain on pension liability					225	225
Stock-based compensation expense		574				574
Stock-based consulting fees	$ 2	598				600
Stock-based consulting fees (in shares)	190
Stock buy-back			$ (347)			(347)
Stock buy-back (in shares)			(210)
Balance at Jun. 30, 2020	$ 383	135,389	$ (56,778)	1,285	(2,949)	77,330
Balance (in shares) at Jun. 30, 2020	38,306		(6,164)
Balance at Mar. 31, 2020	$ 382	135,095	$ (56,513)	(19,250)	(3,062)	56,652
Balance (in shares) at Mar. 31, 2020	38,240		(6,002)
Net loss attributable to common stockholders				20,535		20,535
Settlement of stock awards	$ 1		$ (52)			(51)
Settlement of stock awards (in shares)	66		(26)
Unrealized gain on pension liability					113	113
Stock-based compensation expense		294				294
Stock buy-back			$ (213)			(213)
Stock buy-back (in shares)			(136)
Balance at Jun. 30, 2020	$ 383	135,389	$ (56,778)	1,285	(2,949)	77,330
Balance (in shares) at Jun. 30, 2020	38,306		(6,164)
Balance at Dec. 31, 2020	$ 383	135,978	$ (56,791)	(9,503)	(2,159)	67,908
Balance (in shares) at Dec. 31, 2020	38,345		(6,173)
Net loss attributable to common stockholders				(11,303)		(11,303)
Settlement of stock awards	$ 6		$ (375)			(369)
Settlement of stock awards (in shares)	508		(225)
Unrealized gain on pension liability					237	237
Stock-based compensation expense		351				351
Balance at Jun. 30, 2021	$ 389	136,329	$ (57,166)	(20,806)	(1,922)	56,824
Balance (in shares) at Jun. 30, 2021	38,853		(6,398)
Balance at Mar. 31, 2021	$ 388	136,151	$ (57,166)	(16,092)	(2,040)	61,241
Balance (in shares) at Mar. 31, 2021	38,841		(6,398)
Net loss attributable to common stockholders				(4,714)		(4,714)
Settlement of stock awards	$ 1					1
Settlement of stock awards (in shares)	12
Unrealized gain on pension liability					118	118
Stock-based compensation expense		178				178
Balance at Jun. 30, 2021	$ 389	$ 136,329	$ (57,166)	$ (20,806)	$ (1,922)	$ 56,824
Balance (in shares) at Jun. 30, 2021	38,853		(6,398)