Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Payables And Accruals [Abstract]
Accrued employee compensation	$ 8,560	$ 14,512
Accrued warranty	429	234
Accrued rebates	680	824
Accrued product development costs	5,679	6,339
Other accrued liabilities	2,047	1,869
Total accrued liabilities	$ 17,395	$ 23,778