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Accrued Liabilities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 2,066,000 $ 1,807,000  
Current portion of royalty payments 800,000 1,375,000  
Accrued income taxes 640,000 306,000  
Accrued professional services 609,000 650,000  
Accrued product warranty 588,000 1,003,000 740,000
Loan commitment for related party notes receivable 0 868,000  
Other accrued liabilities 2,499,000 1,588,000  
Accrued liabilities, total $ 7,202,000 $ 7,597,000