Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Geographic Revenue (Details)

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Summary of Significant Accounting Policies - Geographic Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Geographic revenue information    
Total Revenue $ 83,412 $ 82,837
Total North America    
Geographic revenue information    
Total Revenue 51,276 41,265
United States    
Geographic revenue information    
Total Revenue 45,480 39,100
Mexico    
Geographic revenue information    
Total Revenue 5,005 2,007
All other North America    
Geographic revenue information    
Total Revenue 791 158
Total Europe    
Geographic revenue information    
Total Revenue 16,062 15,586
Russia    
Geographic revenue information    
Total Revenue 3,176 2,824
All other Europe    
Geographic revenue information    
Total Revenue 12,886 12,762
Asia    
Geographic revenue information    
Total Revenue 5,229 8,378
Australia    
Geographic revenue information    
Total Revenue 3,874 5,443
All other    
Geographic revenue information    
Total Revenue $ 6,971 $ 12,165