Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019
Summary of Significant Accounting Policies
Deferred professional costs	$ 210,000		$ 210,000		$ 251,000
Accumulated amortization of deferred costs	244,000		244,000		$ 399,000
Amortization of deferred costs	$ 45,000	$ 91,000	$ 150,000	$ 193,000