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Summary of Significant Accounting Policies Concentration of Credit Risk, Significant Customers and Channel Partners) (Details) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accounts Receivable [Member] | Customer A [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 31.00% | 34.00% |
Accounts Receivable [Member] | Customer B [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 27.00% | 33.00% |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 68.00% | 65.00% | 67.00%
Product Concentration Risk [Member] | Sales Revenue, Product Line [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 67.00% | 66.00% | 70.00%

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