Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended		9 Months Ended
	Oct. 31, 2015 Customer	Jan. 31, 2015 Customer	Oct. 31, 2015 Customer	Oct. 31, 2014 Customer	Oct. 31, 2015 Source Customer	Oct. 31, 2014 Customer
Concentration Risk [Line Items]
Number of revenue sources | Source					3
Credit Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of major customer	0	0	0		0
Concentration risk percentage	10.00%	10.00%
Customer Concentration Risk | Revenue
Concentration Risk [Line Items]
Number of major customer	0		0	0	0	0
Concentration risk percentage			10.00%	10.00%	10.00%	10.00%
Geographic Concentration Risk | Revenue | United States
Concentration Risk [Line Items]
Concentration risk percentage			81.00%	80.00%	80.00%	80.00%
Geographic Concentration Risk | Property and Equipment | United States
Concentration Risk [Line Items]
Concentration risk percentage	99.00%	98.00%