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Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
BELGIUM    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues $ 22 $ 49
FRANCE    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 0 40
CHINA    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 713 359
RUSSIAN FEDERATION    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 85 2
GERMANY    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 13 36
ITALY    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 169 159
KOREA, REPUBLIC OF    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 240 0
SINGAPORE    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 82 215
Other Countries [Member]    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues 441 501
Foreign Revenue [Member]    
Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]    
Revenues $ 1,765 $ 1,361