Consolidated Statements of Stockholders’ Deficit - USD ($) $ in Millions	Common stock	Additional paid in capital	Accumulated other comprehensive income	Accumulated deficit	Total
Balance at Dec. 31, 2018		$ 329.9	$ 55.9	$ (404.2)	$ (18.4)
Balance (in Shares) at Dec. 31, 2018	20,870,397
Foreign currency translation adjustments			(2.4)		(2.4)
Actuarial losses on pension plan			(6.9)		(6.9)
Change in fair value of hedging instrument			2.9		2.9
Reclassification of gain (Loss) on hedging instrument to comprehensive income			(4.4)		(4.4)
Conversion of awards previously classified as derivatives		0.8			0.8
Shares issued in earnout		8.6			8.6
Shares issued in earnout (in Shares)	1,323,558
Shares issued upon net settlement of RSUs		(0.9)			(0.9)
Shares issued upon net settlement of RSUs (in Shares)	36,813
Stock-based compensation expense		8.2			8.2
Net loss				(37.0)	(37.0)
Balance at Dec. 31, 2019		346.6	45.1	(441.2)	(49.5)
Balance (in Shares) at Dec. 31, 2019	22,230,768
Foreign currency translation adjustments			(5.4)		(5.4)
Stock-based compensation expense - ESPP
Stock-based compensation expense - ESPP (in Shares)	7,649
Actuarial losses on pension plan			(7.2)		(7.2)
Change in fair value of hedging instrument			(2.9)		(2.9)
Reclassification of gain (Loss) on hedging instrument to comprehensive income			1.5		1.5
Shares issued upon net settlement of RSUs		(0.7)			(0.7)
Shares issued upon net settlement of RSUs (in Shares)	192,058
Stock-based compensation expense		4.7			4.7
Net loss				(29.2)	(29.2)
Balance at Dec. 31, 2020		$ 350.6	$ 31.1	$ (470.4)	$ (88.7)
Balance (in Shares) at Dec. 31, 2020	22,430,475