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Share-Based Payments - Summary of Warrant Activity (Details) - Warrants - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of Shares, Beginning Balance 2,004,284  
Number of Shares, Granted 0  
Number of Shares, Exercised 0  
Number of Shares, Expired 0  
Number of Shares, Ending Balance 2,004,284 2,004,284
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted Average Exercise Price, Beginning Balance (in usd per share) $ 5.57  
Weighted Average Exercise Price, Granted (in usd per share) 0  
Weighted Average Exercise Price, Exercised (in usd per share) 0  
Weighted Average Exercise Price, Expired (in usd per share) 0  
Weighted Average Exercise Price, Ending Balance (in usd per share) $ 5.57 $ 5.57
Weighted Average Remaining Contractual Life (in years) 2 years 6 months 3 days 2 years 9 months 6 days
Aggregate Intrinsic Value, Beginning Balance $ 0  
Aggregate Intrinsic Value, Ending Balance $ 0 $ 0