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INCOME TAXES - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred tax asset adjustment due to change in enacted tax rate | $ 23,000,000 |  | $ 0 | $ 0 | $ 22,630,000 |
Provision for income taxes |  |  | 832,000 | 569,000 | 66,294,000 |
Undistributed earnings (losses) of foreign subsidiaries |  |  | 9,000,000.0 | 200,000 | (19,700,000) |
Deferred tax assets, valuation allowance |  |  | 115,435,000 | 65,948,000 |  |
Federal tax rate |  | 34.00% |  |  |  |
Unrecognized tax benefits |  |  | 6,115,000 | 5,033,000 | 3,980,000 | $ 3,331,000
Accrued penalties and interest |  |  | 0 | $ 0 | $ 0 |
Internal Revenue Service (IRS) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Research tax credit carryforwards |  |  | 12,900,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 203,700,000 |  |  |
Research tax credit carryforwards |  |  | 14,100,000 |  |  |
Tax Year 2019 And 2020 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 280,500,000 |  |  |
Tax Years Prior To 2019 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 156,300,000 |  |  |

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