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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Components of accrued liabilities [Abstract]            
Accrued compensation and related charges $ 1,638   $ 1,762      
Accrued product warranty 980 1,227 1,048 804 749 588
Current portion of royalty payments 800   800      
Dividends payable by consolidated joint ventures 647   649 1,168    
Accrued professional services 415   543      
Accrued income taxes 206   125      
Other accrued liabilities 2,436   2,359      
Accrued liabilities, total $ 7,122   $ 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