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Balance Sheet Information (Details 2) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Restricted Cash    
Restricted cash $ 2,738,000 $ 2,017,000
Accounts Receivable, Net    
Allowance for doubtful accounts receivable (in dollars) 2,400,000 500,000
Inventories    
Materials 34,301,000 36,523,000
Work in process 12,900,000 13,363,000
Finished goods 12,525,000 9,921,000
Inventories 59,726,000 59,807,000
Collateral for Bank Guarantees
   
Restricted Cash    
Restricted cash $ 2,700,000 $ 2,000,000