Property and Equipment, Net - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2013 sqft	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation		$ 300,000	$ 200,000	$ 789,000	$ 545,000
Lease agreement new headquarters	35,000
Initial lease term	5 years
Capitalized internal-use software		1,100,000		1,100,000
Leasehold improvement [Member]
Property, Plant and Equipment [Line Items]
Capitalized leasehold improvement		700,000		700,000
Internal-use software [Member]
Property, Plant and Equipment [Line Items]
Capitalized internal-use software		$ 1,100,000		$ 1,100,000
Estimated economic useful life				3 years