Accounts Payable, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Payables and Accruals [Abstract]
Accounts payable	$ 4,417	$ 4,253
Accrued employee compensation	11,034	11,341
Accrued professional services and associated costs	2,063	1,333
Accrued Knowledge Network application provider fees	2,353	1,860
Accrued sales and use tax	1,391	1,846
Accrued employee stock purchase plan withholdings liability	918	3,750
Accrued other liabilities	4,857	3,033
Total accounts payable, accrued expenses and other current liabilities	$ 27,033	$ 27,416