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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%