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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 1,694 $ 2,656  
Current portion of royalty payments 688 800  
Accrued product warranty 668 802  
Accrued professional services 418 509  
Dividends payable by consolidated joint ventures 566 563 $ 647
Accrued income taxes 279 119  
Other accrued liabilities 1,730 2,185  
Accrued liabilities, total $ 6,043 $ 7,634