| Schedule of changes in deferred revenue |
Changes in deferred revenue are as follows as of March 31, 2018 and 2017 (in thousands):
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2018
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2017
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FPP Balance, beginning of the period
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$
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3,414
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$
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2,929
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FPP Billings
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15,138
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13,447
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FPP Revenue recognized
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(15,003)
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(12,962)
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Balance attributed to FPP contracts
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3,549
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3,414
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Distributor Support System
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1,087
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Deposits
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1,960
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1,636
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Deferred revenue balance, end of the period
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$
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6,596
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$
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5,050
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