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Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Deferred Revenue      
Increase in deposits $ 100    
Change in balance attributed to FPP contracts (49) $ 153  
Changes in deferred revenue      
Deferred revenue balance, end of the period 4,999   $ 5,050
FPP agreements      
Deferred Revenue      
Change in balance attributed to FPP contracts (100)    
Changes in deferred revenue      
FPP Balance, beginning of the period 3,414    
FPP Billings 7,164    
FPP Revenue recognized (7,309)    
Balance attributed to FPP contracts 3,269    
Deposits 1,730    
Deferred revenue balance, end of the period $ 4,999