Summary of Significant Accounting Policies - Schedule of Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	9 Months Ended
Apr. 30, 2019 USD ($)
Fair value of promissory notes at July 31, 2018	$ 2,125
Additions:	100
Reductions:	2,225
Changes in fair value
Fair value at April 30, 2019

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of increase (decrease) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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