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Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Warrant Derivative Liability (Narrative) (Details)

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Fair Value Measurements - Warrant Derivative Liability (Narrative) (Details)
Apr. 30, 2018
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Warrants With Price Protection [Member] Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý
Number of warrants containing price protection 62,500