Accrued Expenses and Other Current Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued compensation	$ 6,750	$ 6,605
2016 Employee Stock Purchase Plan
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued compensation	$ 2,200