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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Components of accrued liabilities [Abstract]            
Accrued compensation and related charges $ 1,817   $ 2,066      
Dividends payable by consolidated joint ventures 1,175   0      
Accrued product warranty 895 804 588 697 740 1,003
Current portion of royalty payments 800   800      
Accrued professional services 654   609      
Accrued income taxes 156   640      
Other accrued liabilities 3,711   2,499      
Accrued liabilities, total $ 9,208   $ 7,202