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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Accrued Liabilities [Abstract]            
Value-added taxes payable $ 1,521   $ 123      
Accrued compensation and related charges 1,409   1,807      
Current portion of royalty payments 1,025   1,375      
Accrued product warranty 740 997 1,003 877 798 740
Accrued professional services 500   650      
Dividends payable by joint ventures 488   0      
Advances from customers 471   74      
Loan commitment for related party notes receivable 0   868      
Other accrued liabilities 2,206   1,697      
Accrued liabilities, total $ 8,360   $ 7,597 [1]      
[1] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.