Net Loss Per Share - Schedule of Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Numerator:
Net loss and comprehensive loss	$ (41,512)	$ (50,353)	$ (60,793)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	29,769	10,651	3,413
Net loss per share, basic and diluted (usd per share)	$ (1.39)	$ (4.73)	$ (17.81)

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

No definition available.

Name:	us-gaap_EarningsPerShareBasicAndDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration