Accrued Expenses - Accrued Expenses (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued payroll	$ 2,207	$ 1,828
Sales and value added taxes	2,615	4,075
Accrued commissions and bonuses	2,871	3,900
Accrued income taxes payable	763	541
Deferred rent, current portion	540	186
Legal and professional	673	805
Other	900	864
Total accrued expenses	$ 10,569	$ 12,199