Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
	Oct. 31, 2012	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Nov. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Initial public offering price per share	$ 6.00
Net proceeds from shares issued and over-allotment options exercised in connection with initial public offering after deducting underwriting discounts and commissions and other offering expenses				$ 30,400,000
Redeemable convertible preference shares converted to ordinary shares	13,315,727
Redeemable convertible preference shares conversion	Converted into ordinary shares on a one-to-one basis
Cash equivalents, treatment		Highly liquid investments with original maturities of less than three months at the time of purchase to be cash equivalents.
Marketable securities, treatment		Investments that are highly liquid with original maturities at the time of purchase greater than three months are considered as marketable securities.
Write-offs of accounts receivable		0	0	0
Allowance for doubtful accounts		0	0
Estimated useful life		3 years	3 years	3 years
Capitalized internal-use software		1,600,000
Impairment of long-lived assets		0
Impairment losses on investment		$ 0
Expected dividend yield		0.00%	0.00%	0.00%
IPO [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, New Issues	6,000,000
Stockholders [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, New Issues	1,095,349
Over Allotment Option [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, New Issues					900,000