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Operating Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Leases [Abstract]        
Cash payments for operating leases $ 975 $ 527 $ 1,406 $ 1,053
Right-of-use assets recognized in exchange for new operating lease obligations     $ 303 $ 120