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Net Loss Per Share - Additional Information (Detail) - shares
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common stock subject to repurchase or forfeiture 0 0
Antidilutive securities excluded from computation of diluted net loss per share 6,543,678 6,845,761