Summary of Significant Accounting Policies - Deferred Commissions Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Amortization of deferred commissions	$ 95,000		$ 150,000
Impairment losses for capitalized costs	0	$ 0	0	$ 0
Prepaid Expenses and Other Current Assets
Deferred commission costs paid and payable	155,000		155,000
Other Noncurrent Assets
Deferred commission costs paid and payable	$ 319,000		$ 319,000