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Line of Credit and Credit Facility - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Debt Disclosure [Abstract]    
Principal $ 102,494 $ 50,201
Less: unamortized debt issuance costs (5,249) (3,869)
Net carrying amount $ 97,245 $ 46,332