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1. THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 USD ($) subsidiary facility item customer | Mar. 31, 2020 USD ($) customer | Mar. 31, 2019 USD ($) customer
Basis of consolidation and risks and uncertainties |  |  |
Number of subsidiaries | subsidiary | 4 |  |
Number of principal operations near fault lines | facility | 2 |  |
Cash, cash equivalents and short-term and long-term investments | $ | $ 59,700 |  |
Allowance for doubtful accounts receivable write offs | $ | $ 0 | $ 0 | $ 0
Number of reporting units | item | 1 |  |
Accounts receivable [Member] |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Number of customers | customer | 4 | 3 |
Accounts receivable [Member] | Customer One |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 36.00% | 33.00% |
Accounts receivable [Member] | Customer Two |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 28.00% | 20.00% |
Accounts receivable [Member] | Customer Three |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 15.00% | 19.00% |
Accounts receivable [Member] | Customer Four |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 12.00% |  |
Net revenue [Member] |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Number of customers | customer | 4 | 4 | 4
Net revenue [Member] | Customer One |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 30.00% | 34.00% | 31.00%
Net revenue [Member] | Customer Two |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 22.00% | 17.00% | 22.00%
Net revenue [Member] | Customer Three |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 21.00% | 15.00% | 18.00%
Net revenue [Member] | Customer Four |  |  |
Basis of consolidation and risks and uncertainties |  |  |
Percentage attributable to customers | 15.00% | 15.00% | 15.00%

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