Income Taxes (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jan. 31, 2020	Jul. 31, 2019
Income Taxes (Textual)
Federal statutory corporate tax, description	The Tax Act provides for comprehensive tax legislation that, among other things, reduces the U.S. federal statutory corporate tax rate from 35.0% to 21.0% effective January 1, 2018, broadens the U.S. federal income tax base, requires companies to pay a one-time repatriation tax on earnings of certain foreign subsidiaries that were previously tax deferred ("transition tax"), and creates new taxes on certain foreign sourced earnings.
Federal net operating loss		$ 22,300
Federal net operating loss, expiration date	Jul. 31, 2038	Jul. 31, 2026
Percentage of available to offset of taxable income		80.00%
Federal net operating loss		$ 3,200
Net operating loss foreign operations		$ 1,200