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Basis of Presentaion - Transaction Related to Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Note payable    
Beginning fair value $ 3,004  
Imputed interest 115  
Change in estimates (43)  
Interest expense 72  
Payments (9) (182)
Ending fair value $ 3,076