Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jan. 31, 2015	Apr. 30, 2016	Apr. 30, 2015
Operating Leased Assets [Line Items]
Operating lease expiration date		2018-02
Operating leases outstanding		$ 2,800,000
Rent expense		300,000	$ 300,000
Non-cancelable purchase commitments		2,600,000
Lease Agreement One
Operating Leased Assets [Line Items]
Capital lease of computer equipment maturity date	2016-12
Right to purchase the equipment, amount	$ 1
Repayments of capital lease obligations		$ 600,000