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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Significant Accounting Policies [Line Items]      
Net as of March 31, 2019 and 2020    
Kayser Myanmar [Member]      
Significant Accounting Policies [Line Items]      
Gross as of April 1, 2018, March 31, 2019 and 2020 77 $ 77 $ 77
Accumulated impairment loss as of April 1, 2018    
Impairment losses during the year ended March 31, 2019   (77)  
Accumulated impairment loss as at March 31, 2019 and 2020 (77) (77)  
Net as of March 31, 2019 and 2020