Leases - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2018	Oct. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term (years)			5 years 2 months 2 days
Rent expense	$ 1,543,000	$ 4,512,000
Weighted-average discount rate			6.37%
Manufacturing and Distribution Facility in Torrance, CA [Member]
Lessee, Lease, Description [Line Items]
Operating lease period (in years)			5 years