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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 2,610 $ 2,129  
Accrued professional services 583 709  
Current portion of royalty payments 575 575  
Dividends payable by consolidated joint ventures 499 534 $ 563
Accrued product warranty 251 497 $ 802
Accrued income taxes 203 225  
Other accrued liabilities 1,638 1,712  
Accrued liabilities, total $ 6,359 $ 6,381