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Notes Payable to Unrelated Parties (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Notes payable $ 70 $ 70 [1]
Robert Shaw
   
Debt Instrument [Line Items]    
Notes payable 15 15
Ventana Medical Systems, Inc
   
Debt Instrument [Line Items]    
Notes payable 21 21
Xillix Technologies Corporation
   
Debt Instrument [Line Items]    
Notes payable $ 34 $ 34
[1] Derived from audited information