Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	(34.00%)	(34.00%)
Increase (decrease) in income taxes resulting from:
Imputed interest income on intercompany receivables from foreign subsidiaries	0.00%	400.00%
Nondeductible or non-taxable items	2700.00%	(300.00%)
Other temporary differences	(100.00%)	2600.00%
Change in valuation allowance	800.00%	700.00%
Effective tax rate	0.00%	0.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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