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Share-Based Payments - Summary of Warrant Activity (Details) - Warrants - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Jan. 31, 2020
Apr. 30, 2019
Number of Shares    
Beginning balance (in shares) 1,671,440  
Granted (in shares) 0  
Exercised (in shares) 0  
Canceled (in shares) 0  
Expired (in shares) (1,667)  
Ending balance (in shares) 1,669,773 1,671,440
Weighted Average Exercise Price    
Beginning Balance (in usd per share) $ 6.20  
Granted (in usd per share) 0.00  
Exercised (in usd per share) 0.00  
Canceled (in usd per share) 0.00  
Expired (in usd per share) 4.80  
Ending Balance (in usd per share) $ 5.66 $ 6.20
Weighted Average Remaining Contractual Life (Years) 1 month 1 day 10 months 25 days
Aggregate Intrinsic Value $ 3,225 $ 5,730