Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Nov. 30, 2012	Oct. 31, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Initial public offering of shares		6,000,000
Shares issued during period, shares sold by certain shareholders		1,095,349
Over-allotment option shares sold	900,000
Initial public offering price per share	$ 6.00	$ 6.00
Net proceeds from shares issued upon initial public offering and over-allotment share options exercised	$ 30.4
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 maturities of less than three months at the time of purchase to be cash equivalents.
Short-term investment, treatment			Investments with maturities at the time of acquisition greater than three months but less than one year are classified as short-term investments
Cash equivalents and short-term investments			0	0
Write-offs of accounts receivable			0	0	0
Allowance for doubtful accounts			0	0
Estimated useful life			3 years	3 years	3 years
Capitalizes internal-use software			1.1
Impairment of long-lived assets			0
Impairment losses on investment			$ 0
Expected dividend yield			0.00%	0.00%	0.00%