Annual report pursuant to Section 13 and 15(d)

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

v3.19.2
Fair Value Measurements - Warrant Derivative Liability (Narrative) (Details)
Apr. 30, 2018
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Warrants With Price Protection [Member]  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Number of warrants containing price protection 62,500