Accrued Expenses - Accrued Expenses (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Payables And Accruals [Abstract]
Accrued payroll	$ 1,869	$ 2,207
Sales and value added taxes	1,061	2,615
Accrued commissions and bonuses	1,018	2,871
Accrued income taxes payable	590	763
Deferred rent, current portion	533	540
Legal and professional	731	673
Other	637	900
Total accrued expenses	$ 6,439	$ 10,569