Leases - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Nov. 14, 2017
Lessee, Lease, Description [Line Items]
Purchase Agreement, Non-binding Commitment, Financing, Interest Rate	6.75%
Term extension (in months)			62 months
Weighted-average remaining lease term (years)	5 years 8 months 12 days
Rent expense		$ 1,450,000
Weighted-average discount rate	6.39%
Manufacturing and Distribution Facility in Torrance, CA [Member]
Lessee, Lease, Description [Line Items]
Operating lease period (in years)	5 years