Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued employee compensation	$ 12,930	$ 14,512
Accrued warranty	500	234
Accrued rebates	1,119	824
Accrued product development costs	6,289	6,339
Other accrued liabilities	2,494	1,869
Total accrued liabilities	$ 23,332	$ 23,778