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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Components of accrued liabilities [Abstract]        
Accrued product warranty $ 1,227 $ 1,048 $ 749 $ 588
Accrued compensation and related charges 1,210 1,762    
Current portion of royalty payments 800 800    
Dividends payable by consolidated joint ventures 729 649 2,365  
Accrued professional services 279 543    
Accrued income taxes 100 125    
Other accrued liabilities 2,301 2,359    
Accrued liabilities, total $ 6,646 $ 7,286