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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 2,129 $ 2,656  
Accrued professional services 709 509  
Current portion of royalty payments 575 800  
Dividends payable by consolidated joint ventures 534 563 $ 651
Accrued product warranty 497 802 $ 1,048
Accrued income taxes 225 119  
Other accrued liabilities 1,712 2,185  
Accrued liabilities, total $ 6,381 $ 7,634