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Leases - ASC 842 Quantitative Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Leases [Abstract]    
Operating lease cost $ 1,320 $ 2,700
Short-term lease cost 82 136
Short-term sublease income (20) (30)
Total lease cost $ 1,382 2,806
Cash paid for amounts included in the measurement of lease liabilities   1,320
Right-of-use assets obtained in exchange for new lease liabilities   $ 641
Weighted-average remaining lease term (years) 5 years 5 months 12 days 5 years 5 months 12 days
Weighted-average discount rate 6.38% 6.38%