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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 1,533 $ 2,129  
Current portion of royalty payments 575 575  
Dividends payable by consolidated joint ventures 552 534 $ 646
Accrued product warranty 431 497  
Accrued income taxes 371 225  
Accrued professional services 295 709  
Other accrued liabilities 1,600 1,712  
Accrued liabilities, total $ 5,357 $ 6,381