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Financial Instruments and Fair Value - Summary of Contractual Maturities of Investments (Detail) - USD ($)
$ in Thousands
Jul. 31, 2016
Jan. 31, 2016
Available For Sale Securities Debt Maturities Fair Value [Abstract]    
Due within one year $ 52,856 $ 33,449
Due within one to two years 7,767 6,918
Total cash equivalents and marketable securities $ 60,623 $ 40,367