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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Financing Arrangements (Long-Term Debt Outstanding, Revolving Credit and European Investment Bank Financing Agreement) (Details) € in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)	Jun. 29, 2017 USD ($)	Jun. 29, 2017 EUR (€)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Total debt	$ 95,975,000			$ 96,516,000
Less current portion of long-term debt	24,122,000			21,301,000
Total long-term debt	71,853,000			75,215,000
Tranche Two
Debt Instrument [Line Items]
Finance contract, borrowing base		$ 57,000,000	€ 50
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding principal amount of short-term unsecured revolving credit agreements	$ 28,000,000			$ 26,400,000
Interest Rate (percent)	0.20%			10.50%
European Investment Bank
Debt Instrument [Line Items]
Finance contract, borrowing base		118,000,000	100
Proceeds from loans	$ 0
European Investment Bank \| Tranche One
Debt Instrument [Line Items]
Finance contract, borrowing base		$ 59,000,000	€ 50
Loans Payable \| European Investment Bank
Debt Instrument [Line Items]
Total debt	$ 78,590,000			$ 78,987,000
Interest Rate (percent)	0.95%
Loans Payable \| Mediocredito Italiano
Debt Instrument [Line Items]
Total debt	$ 7,719,000			7,276,000
Loans Payable \| Mediocredito Italiano \| Minimum
Debt Instrument [Line Items]
Interest Rate (percent)	0.50%
Loans Payable \| Mediocredito Italiano \| Maximum
Debt Instrument [Line Items]
Interest Rate (percent)	3.07%
Loans Payable \| Banca del Mezzogiorno
Debt Instrument [Line Items]
Total debt	$ 6,490,000			6,747,000
Loans Payable \| Banca del Mezzogiorno \| Minimum
Debt Instrument [Line Items]
Interest Rate (percent)	0.50%
Loans Payable \| Banca del Mezzogiorno \| Maximum
Debt Instrument [Line Items]
Interest Rate (percent)	3.15%
Loans Payable \| Bpifrance
Debt Instrument [Line Items]
Total debt	$ 1,603,000			1,909,000
Interest Rate (percent)	2.58%
Loans Payable \| Novalia SA
Debt Instrument [Line Items]
Total debt	$ 831,000			798,000
Loans Payable \| Novalia SA \| Minimum
Debt Instrument [Line Items]
Interest Rate (percent)	0.00%
Loans Payable \| Novalia SA \| Maximum
Debt Instrument [Line Items]
Interest Rate (percent)	2.45%
Mortgages \| Mediocredito Italiano
Debt Instrument [Line Items]
Total debt	$ 742,000			$ 799,000
Mortgages \| Mediocredito Italiano \| Minimum
Debt Instrument [Line Items]
Interest Rate (percent)	0.40%
Mortgages \| Mediocredito Italiano \| Maximum
Debt Instrument [Line Items]
Interest Rate (percent)	0.65%