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Deferred Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in deferred revenue    
Deferred revenue balance, end of the period $ 5,050 $ 4,368
FPP agreements    
Changes in deferred revenue    
FPP Balance, beginning of the period 2,929 2,491
FPP Billings 13,447 11,419
FPP Revenue recognized (12,962) (10,981)
Balance attributed to FPP contracts 3,414 2,929
Deposits 1,636 1,439
Deferred revenue balance, end of the period $ 5,050 $ 4,368