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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |
Provision for income taxes | $ 843,000 | $ 832,000 | $ 569,000 |
Undistributed earnings (losses) of foreign subsidiaries | 15,300,000 | 9,000,000.0 | 200,000 |
Deferred tax assets, valuation allowance | 160,450,000 | 115,435,000 |  |
Research tax credit carryforwards | 5,000,000 |  |  |
Unrecognized tax benefits | 7,053,000 | 6,115,000 | 5,033,000 | $ 3,980,000
Accrued penalties and interest | 0 | $ 0 | $ 0 |
Internal Revenue Service (IRS) |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Research tax credit carryforwards | 15,300,000 |  |  |
State and Local Jurisdiction |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards | 296,600,000 |  |  |
Research tax credit carryforwards | 16,900,000 |  |  |
Tax Year 2019 and 2020 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards | 433,000,000.0 |  |  |
Tax Years Prior to 2019 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards | $ 137,800,000 |  |  |

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