Leases - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2018	Jul. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term (years)			5 years 5 months 12 days
Rent expense	$ 1,519,000	$ 2,969,000
Weighted-average discount rate			6.38%
Manufacturing and Distribution Facility in Torrance, CA [Member]
Lessee, Lease, Description [Line Items]
Operating lease period (in years)			5 years