Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - Grants from Governmental Agencies (Details)

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Organization and Significant Accounting Policies - Grants from Governmental Agencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accounting Policies [Abstract]      
Revenue from grants $ 4,559 $ 787 $ 0