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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Components of accrued liabilities [Abstract]            
Accrued compensation and related charges $ 1,823   $ 1,762      
Accrued product warranty 904 980 1,048 895 804 588
Current portion of royalty payments 800   800      
Dividends payable by consolidated joint ventures 647   649      
Accrued professional services 528   543      
Accrued income taxes 244   125      
Other accrued liabilities 1,844   2,359      
Accrued liabilities, total $ 6,790   $ 7,286 [1]      
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013.