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Debt - Narrative (Details) $ / shares in Units, € in Thousands, shares in Thousands, ¥ in Millions							12 Months Ended
	Dec. 10, 2020 USD ($)	Jul. 20, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 24, 2020 EUR (€)	Mar. 27, 2020 USD ($) shares	Aug. 31, 2017 USD ($) subsidiary	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	Jul. 20, 2020 CNY (¥)
Debt Instrument [Line Items]
Unamortized debt issuance costs							$ 481,000	$ 289,000
Payments of debt issue costs							3,077,000	0
Short-term Debt							3,025,000	2,888,000
Reclassification of debt conversion option from debt to equity, net (Note 5)			$ 36,952,000				36,952,000	0
Reclassification of debt to equity, tax effect							281,000	1,086,000
Conversion of convertible notes							788,000	3,547,000
Decrease in additional paid-in capital							(1,376,000)
Noncash interest paid in kind							10,503,000	15,912,000
Selling, General and Administrative Expenses
Debt Instrument [Line Items]
Payments of debt issue costs							1,376,000
3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2024
Debt Instrument [Line Items]
Convertible debt, face value							$ 98,788,000	0
Debt instrument, maturity date							Aug. 31, 2024
Convertible notes, conversion price per common share \| $ / shares							$ 4.56
Percentage of aggregate principal holder consent required to release lien							66.67%		66.67%
Debt repurchase price (as a percent)							100.00%
Noncash interest paid in kind							$ 3,653,000
3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2024 \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as a percent)							3.00%		3.00%
3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2024 \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as a percent)							5.00%		5.00%
5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2022
Debt Instrument [Line Items]
Convertible debt, face value							$ 3,958,000	193,660,000
Debt instrument, maturity date							Aug. 31, 2022
Convertible notes, conversion price per common share \| $ / shares							$ 37.68
Noncash interest paid in kind							$ 3,483,000	12,999,000
5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2022 \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as a percent)							5.00%		5.00%
5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2022 \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as a percent)							7.00%		7.00%
Convertible Debt \| 3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2024
Debt Instrument [Line Items]
Aggregate principal amount of existing notes tendered and accepted in exchange					$ 95,135,000
Shares issued upon conversion of debt (in shares) \| shares					7,026
Convertible Debt \| 5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due August 31, 2022
Debt Instrument [Line Items]
Aggregate principal amount of existing notes tendered and accepted in exchange					$ 190,200,000
Existing Notes not tendered and still outstanding					3,693,000
Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit capacity \| €									€ 6,500
Line of credit							$ 0	2,888,000
Percent of eligible accounts factored for credit facility borrowing							100.00%
Factoring fee percentage							0.16%
Foreign Line of Credit \| Euribor
Debt Instrument [Line Items]
Interest rate margin (as a percent)							1.00%
Foreign Line of Credit \| LIBOR
Debt Instrument [Line Items]
Interest rate margin (as a percent)							1.00%
Additional Paid-in Capital
Debt Instrument [Line Items]
Reclassification of debt conversion option from debt to equity, net (Note 5)							$ 36,952,000
Reclassification of debt to equity, tax effect								1,086,000
Conversion of convertible notes					$ 25,239,000		$ 788,000	3,547,000
Revolving Credit Facility \| Floating Rate Revolving A Credit Facility due February 28, 2022
Debt Instrument [Line Items]
Number of subsidiaries \| subsidiary						4
Line of credit capacity						$ 125,000,000
Fee for early termination or payment reduction (as a percentage)							0.50%
Fixed charge ratio							1.0		1.0
Covenant borrowing threshold						$ 12,500,000	$ 8,750
Revolving Credit Facility \| Floating Rate Revolving A Credit Facility due February 28, 2023
Debt Instrument [Line Items]
Debt instrument, maturity date							Feb. 28, 2023
Line of credit							$ 78,398,000	102,000,000
Commitment fee on unused capacity (as a percent)							0.25%
Interest rate during period (as a percent)							3.75%
Revolving Credit Facility \| Floating Rate Revolving A Credit Facility due February 28, 2023 \| LIBOR
Debt Instrument [Line Items]
Interest rate margin (as a percent)							4.00%
Revolving Credit Facility \| 15.00% Revolving B (Priority) Credit Facility due February 28, 2023
Debt Instrument [Line Items]
Line of credit facility, additional borrowing capacity	$ 25,000,000
Stated interest rate (as a percent)							15.00%		15.00%
Debt instrument, maturity date							Feb. 28, 2023
Line of credit							$ 8,073,000	0
Noncash interest paid in kind							$ 73,000
Revolving Credit Facility \| 12.00% Revolving B Credit Facility due February 28, 2022(b)
Debt Instrument [Line Items]
Line of credit capacity	21,500,000
Stated interest rate (as a percent)							12.00%		12.00%
Debt instrument, maturity date							Feb. 28, 2023
Line of credit							$ 29,081,000	25,788,000
Commitment fee on unused capacity (as a percent)							0.25%
Average daily revolving facility threshold (as a percent)							50.00%
Covenant borrowing threshold	$ 8,750,000
Noncash interest paid in kind							$ 3,293,000	2,913,000
Revolving Credit Facility \| 12.00% Revolving B Credit Facility due February 28, 2022(b) \| Maximum
Debt Instrument [Line Items]
Commitment fee on unused capacity (as a percent)							0.375%
Revolving Credit Facility \| 12.00% Revolving B Credit Facility due February 28, 2022(b) \| LIBOR
Debt Instrument [Line Items]
Interest rate margin (as a percent)	4.00%
China Credit Facility
Debt Instrument [Line Items]
Line of credit capacity		$ 3,025,000								¥ 20
Stated interest rate (as a percent)		3.60%								3.60%
Debt instrument, maturity date		Mar. 01, 2021
Short-term Debt							$ 3,025,000
Covid-19 \| 1.00% Paycheck Protection Program Term Note due April 28, 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)							1.00%		1.00%
Debt instrument, maturity date							Apr. 28, 2022
Principal balance of long term debt							$ 10,000,000	0
Covid-19 \| France Term Loan [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)				0.00%
Debt instrument, maturity date				Jun. 24, 2021
Principal balance of long term debt				€ 6,000			$ 7,380,000	$ 0
Commission fees, as a percentage of principal loan balance				0.50%
Option to extend maturity of loan				5 years