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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 1,323 $ 2,656  
Current portion of royalty payments 631 800  
Accrued product warranty 620 802  
Accrued professional services 592 509  
Dividends payable by consolidated joint ventures 544 563 $ 647
Accrued income taxes 165 119  
Other accrued liabilities 1,638 2,185  
Accrued liabilities, total $ 5,513 $ 7,634