Long-term Debt - Additional Information 1 (Detail)		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 02, 2016 USD ($)	Jan. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jul. 31, 2016 USD ($) $ / shares shares	Jul. 31, 2015 $ / shares shares	May 13, 2015 shares
Debt Instrument [Line Items]
Warrants issued to purchase common stock | shares					3,495
Warrant shares issued that were not exercised | shares						65,788
Number of shares issued due warrant shares not exercised on a cashless basis | shares						57,082
Warrants to purchase shares | shares				3,495
Warrants to purchase shares, exercise price | $ / shares				$ 13.68	$ 13.68
Warrants to purchase shares of common stock outstanding and exercisable | shares				3,495
Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Minimum adjusted quick ratio	1.75
Minimum total revenue required per debt covenants		$ 35,000,000	$ 54,000,000	$ 74,750,000.00
Number of warrants issued to SVB | shares				0
Silicon Valley Bank [Member] | Term loan [Member] | Silcon Valley Bank supplemental loan [Member]
Debt Instrument [Line Items]
Supplemental term loan	$ 2,650,000
Silicon Valley Bank [Member] | Term loan [Member] | Silcon Valley Bank supplemental loan [Member] | Prime rate [Member]
Debt Instrument [Line Items]
Line of credit facility, spread interest percentage				0.25%
Line of credit facility, interest rate percentage				3.75%
Silicon Valley Bank [Member] | Term loan [Member] | Silicon Valley Bank term loan [Member]
Debt Instrument [Line Items]
Amount of debt paid off	$ 156,250
Silicon Valley Bank [Member] | Revolving line of credit [Member]
Debt Instrument [Line Items]
Long term debt maximum borrowing capacity				$ 25,000,000.0
Percentage of line of credit facility limited to eligible foreign accounts receivable				30.00%
Increase in interest rate due to an event of default				3.00%
Silicon Valley Bank [Member] | Revolving line of credit [Member] | Prime rate [Member]
Debt Instrument [Line Items]
Line of credit facility, spread interest percentage				0.50%
Line of credit facility, interest rate percentage				4.00%
Silicon Valley Bank [Member] | Revolving line of credit [Member] | Advance amount without restrictions [Member]
Debt Instrument [Line Items]
Long term debt maximum borrowing capacity				$ 7,500,000.0
Silicon Valley Bank [Member] | Revolving line of credit [Member] | Amount subject to accounts receivable borrowing base [Member]
Debt Instrument [Line Items]
Long term debt maximum borrowing capacity				17,500,000.0
Silicon Valley Bank [Member] | Revolving line of credit [Member] | Line of credit [Member]
Debt Instrument [Line Items]
Long term debt maximum borrowing capacity				$ 17,500,000.0
Percentage of line of credit facility limited to eligible accounts receivable				80.00%
Line of credit facility, limited to eligible foreign accounts receivable				$ 6,000,000.0