Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Warrant Activity (Details) (Parenthetical)

v3.7.0.1
Stock-Based Compensation - Summary of Warrant Activity (Details) (Parenthetical)
Apr. 30, 2017
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Conversion price per share $ 4.80