Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jan. 31, 2018
Concentration Risk [Line Items]
Receivables, Long-term Contracts or Programs				$ 3.2
Accounts Receivable, Additional Narrative Disclosure	outstanding for several years as of July 31, 2018. The Company completed all of its deliverables in 2015, and has been engaged in ongoing active efforts to collect this amount. In the second quarter of 2018, the Company received a payment of approximately $0.5 million, which reduced the balance of this receivable. As a result, the Company did not reserve any allowance against this receivable as of July 31, 2018. The Company continues to engage with the customer to ensure full payment of open balances. However, if the Company’s efforts to collect on this account are not successful in fiscal 2018, then the Company may recognize an allowance for all, or substantially all, of any such then uncollected amounts.
Accounts Receivable [Member]
Concentration Risk [Line Items]
Accounts Receivable, Gross	$ 4.9		$ 4.9	5.4
Receivables, Long-term Contracts or Programs				$ 3.7
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			14.80%	34.90%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.90%	10.00%	23.40%