Geographic Information (Details)
$ in Thousands
9 Months Ended
Dec. 31, 2019
USD ($)
segment
Mar. 31, 2019
USD ($)
Geographic information    
Number of operating geographic regions | segment 2  
Long-lived assets $ 5,654 $ 12,159
United States    
Geographic information    
Long-lived assets 5,136 11,648
United Kingdom    
Geographic information    
Long-lived assets $ 518 $ 511