Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Jan. 31, 2017 USD ($) Customer	Jan. 31, 2016 USD ($) Customer	Jan. 31, 2015 USD ($) Customer
Significant Accounting Policies [Line Items]
Net loss on foreign currency transaction	$ (638,000)	$ (789,000)	$ (166,000)
Allowance for doubtful accounts	672,000	115,000
Capitalized commission costs	4,500,000	5,400,000	3,200,000
Amortization of deferred commissions	4,004,000	2,834,000	1,384,000
Advertising expense	446,000	1,700,000	360,000
Capitalized software development cost	$ 4,300,000	$ 3,200,000	$ 2,100,000
2016 Employee Stock Purchase Plan
Significant Accounting Policies [Line Items]
Share based compensation expense recognition and offering period	24 months
Capitalized Software Development Costs
Significant Accounting Policies [Line Items]
Estimated useful life	2 years
Furniture and Equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Furniture and Equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Leasehold Improvements
Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Accounts Receivable | Customer
Significant Accounting Policies [Line Items]
Number of customers comprising 10% or more of total accounts receivable | Customer	0	0
Revenue | Customer
Significant Accounting Policies [Line Items]
Number of customers comprising more than 10% of revenues | Customer	0	0	0
Revenue | Geographic Concentration Risk | Foreign Countries
Significant Accounting Policies [Line Items]
Number of customers comprising more than 10% of revenues | Customer	0	0	0