Consolidated Statements of Stockholders' Deficit - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2020		$ 324.6	$ 30.8	$ (484.2)	$ (128.8)
Balance, shares at Dec. 31, 2020	22,430,475
Foreign currency translation adjustments			0.7		0.7
Actuarial losses on pension plan			10.5		10.5
Change in fair value of hedging instrument			0.3		0.3
Reclassification of loss on hedging instrument to comprehensive income			1.5		1.5
Shares issued in settlement of RSUs		(6.4)			(6.4)
Shares issued in settlement of RSUs, shares	324,122
Shares issued upon exercise of warrants		42.4			42.4
Shares issued upon exercise of warrants, shares	3,678,965
Stock-based compensation expense		11.7			11.7
Net income (loss)				(40.6)	(40.6)
Balance at Dec. 31, 2021		372.3	43.8	(524.8)	(108.7)
Balance, shares at Dec. 31, 2021	26,433,562
Foreign currency translation adjustments			12.7		12.7
Actuarial losses on pension plan			(6.4)		(6.4)
Change in fair value of hedging instrument
Reclassification of loss on hedging instrument to comprehensive income			0.7		0.7
Shares issued in settlement of RSUs		(4.1)			(4.1)
Shares issued in settlement of RSUs, shares	543,294
Stock-based compensation expense		10.0			10.0
Net income (loss)				20.6	20.6
Repurchases of common stock				(10.4)	(10.4)
Repurchases of common stock, shares	(1,067,340)
Balance at Dec. 31, 2022		378.2	50.8	(514.6)	(85.6)
Balance, shares at Dec. 31, 2022	25,909,516
Foreign currency translation adjustments			(5.9)		(5.9)
Actuarial losses on pension plan			(0.7)		(0.7)
Change in fair value of hedging instrument
Reclassification of loss on hedging instrument to comprehensive income			0.3		0.3
Shares issued in settlement of RSUs		(2.9)			(2.9)
Shares issued in settlement of RSUs, shares	435,283
Stock-based compensation expense		10.8			10.8
Net income (loss)				7.6	7.6
Repurchases of common stock				(1.6)	(1.6)
Repurchases of common stock, shares	(125,778)
Balance at Dec. 31, 2023		$ 386.1	$ 44.5	$ (508.6)	$ (78.0)
Balance, shares at Dec. 31, 2023	26,219,021