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Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Noncancelable Operating Leases (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Jan. 31, 2017
Commitments And Contingencies Disclosure [Abstract]    
2018   $ 7,121
Remaining Fiscal 2018 $ 1,859  
2019 7,086 7,019
2020 7,154 7,127
2021 7,192 7,021
2022 7,221 7,068
Thereafter 3,984 3,984
Committed gross lease payments 34,496 39,340
Less proceeds from sublease rental (3,333) (4,244)
Net operating lease obligation $ 31,163 $ 35,096