Notes Payable to Unrelated Parties (Parenthetical) (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Robert Shaw
Debt Instrument [Line Items]
Promissory note	$ 25,000	$ 25,000
Promissory note, date of issue	Sep. 20, 2001	Sep. 20, 2001
Promissory note, interest rate	9.00%	9.00%
Promissory note, due date	Dec. 20, 2001	Dec. 20, 2001
Ventana Medical Systems, Inc
Debt Instrument [Line Items]
Promissory note	62,946	62,946
Promissory note, date of issue	Nov. 30, 2003	Nov. 30, 2003
Promissory note, interest rate	8.00%	8.00%
Promissory note, due date	Dec. 31, 2003	Dec. 31, 2003
Xillix Technologies Corporation
Debt Instrument [Line Items]
Promissory note	$ 361,000	$ 361,000
Promissory note, date of issue	Jun. 26, 1998	Jun. 26, 1998
Promissory note, interest rate	6.00%	6.00%
Promissory note, due date	Dec. 27, 1999	Dec. 27, 1999