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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018
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Accounting Policies [Abstract] |  |
Accounts receivable, gross | $ 3,733 | $ 3,019
Less: Allowance for doubtful accounts | (19) | (29)
Accounts receivable, net | $ 3,714 | $ 2,990

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