Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 10,807	$ 10,943
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 10,807	$ 10,943