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Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
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Accounting Policies [Abstract] |  |
Accounts receivable, gross | $ 3,847 | $ 4,318
Less: Allowance for doubtful accounts | (4) | (4)
Accounts receivable, net | $ 3,843 | $ 4,314

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