Financing Arrangements and Fair Value of Financial Instruments - Narrative (Details)		1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 02, 2021 USD ($)	Feb. 28, 2021 GBP (£)	Mar. 31, 2019 USD ($)	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 GBP (£)	Feb. 28, 2021 USD ($)	Feb. 28, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2016
Debt Instrument [Line Items]
Principal amount outstanding				$ 79,416,000		$ 79,416,000					$ 91,383,000
Long-term debt, excluding current maturities				66,545,000		66,545,000					19,690,000
Unamortized debt discount and debt issuance costs				1,616,000		1,616,000					4,221,000
Net loss				0	$ (1,334,000)	790,000	$ (419,000)
Letters of credit outstanding, amount				45,400,000		45,400,000
Long-term debt				77,800,000		77,800,000					87,162,000
Current debt				11,255,000		11,255,000					67,472,000
Restricted cash and cash equivalents, current				5,900,000		5,900,000
Foreign operations
Debt Instrument [Line Items]
Current debt				5,800,000		5,800,000					3,500,000
Revolving credit facility | U K Subsidiary
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 8,300,000	£ 6,000,000.0
Basis spread on variable rate		3.40%
Debt instrument, periodic payment, principal | £		£ 375,000
Debt instrument, periodic payment terms, balloon payment to be paid | £										£ 1,500,000
Long-term debt | £								£ 7,200,000
Convertible debt, debt component
Debt Instrument [Line Items]
Long-term debt, excluding current maturities				47,100,000		47,100,000
Unamortized debt discount and debt issuance costs				$ 1,500,000		$ 1,500,000
Senior notes
Debt Instrument [Line Items]
Debt conversion rate						0.1071381
Interest rate, effective percentage				11.30%		11.30%		11.30%
Convertible Notes
Debt Instrument [Line Items]
Repurchased face amount				$ 18,300,000	33,100,000	$ 18,300,000	33,100,000
Repurchase amount				18,100,000	$ 29,100,000	18,100,000	$ 29,100,000
Net loss						800,000
Convertible Notes | Revolving credit facility
Debt Instrument [Line Items]
Fixed charge coverage ratio, amount			$ 25,000,000.0
Convertible Notes | Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount												$ 100,000,000.0
Principal amount outstanding				$ 48,567,000		$ 48,567,000					66,912,000
Interest rate, stated percentage												4.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares				$ 9.33		$ 9.33
Unamortized debt discount and debt issuance costs				$ 1,459,000		$ 1,459,000					4,221,000
Long-term debt				47,108,000		47,108,000					62,691,000
Convertible debt, fair value				48,600,000		$ 48,600,000					61,100,000
ABL Facility | Federal Funds Rate
Debt Instrument [Line Items]
Base rate basis spread on variable rate			0.50%
ABL Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Base rate basis spread on variable rate			1.00%
Basis spread on variable rate						2.00%
ABL Facility | London Interbank Offered Rate (LIBOR) | Subsequent event
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
ABL Facility | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
ABL Facility | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
ABL Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
ABL Facility | Base Rate | Subsequent event
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
ABL Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
ABL Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
ABL Facility | Revolving credit facility
Debt Instrument [Line Items]
Principal amount outstanding				14,000,000		$ 14,000,000					19,100,000
Unamortized debt discount and debt issuance costs				0		0					0
Maximum borrowing capacity			$ 200,000,000.0	85,200,000		85,200,000
Maximum borrowing capacity with increase in limit			$ 275,000,000.0
Drawn				14,000,000.0		14,000,000.0
Letters of credit outstanding, amount				700,000		700,000
Remaining borrowing capacity				$ 70,500,000		$ 70,500,000
Line of credit facility covenant minimum fixed charge coverage ratio calculation period			12 months
Line of credit facility covenant minimum fixed charge coverage ratio			1.0										1.25
Fixed charge coverage ratio, amount			$ 22,500,000
Debt, weighted average interest rate				2.10%		2.10%		2.10%
Unused capacity, commitment fee percentage						0.375%
Covenant terms acceleration of other indebtedness			$ 25,000,000.0
Long-term debt				$ 14,000,000		$ 14,000,000					$ 19,100,000
ABL Facility | Revolving credit facility | Subsequent event
Debt Instrument [Line Items]
Drawn	$ 21,100,000
Line of credit facility, current borrowing capacity	107,900,000
ABL Facility | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage						0.25%
ABL Facility | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage						0.375%
ABL Facility | Industrial Solutions | Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity				$ 24,700,000		$ 24,700,000
Line of credit facility covenant minimum fixed charge coverage ratio calculation period			12 months
Line of credit facility covenant minimum fixed charge coverage ratio			1.5
Line of credit facility covenant operating income amount			$ 1,000,000.0
ABL Facility | Industrial Solutions | Revolving credit facility | Subsequent event
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 24,400,000