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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Components of accrued liabilities [Abstract]            
Accrued compensation and related charges $ 1,628   $ 2,066      
Dividends payable by consolidated joint ventures 1,168   0 488    
Accrued product warranty 804 749 588 740 997 1,003
Current portion of royalty payments 800   800      
Accrued income taxes 685   640      
Accrued professional services 484   609      
Other accrued liabilities 3,567   2,499      
Accrued liabilities, total $ 9,136   $ 7,202 [1]      
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.