Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued employee compensation	$ 14,685	$ 14,512
Accrued warranty	500	234
Accrued rebates	972	824
Accrued product development costs	7,605	6,339
Other accrued liabilities	2,686	1,869
Total accrued liabilities	$ 26,448	$ 23,778