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INCOME TAXES - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred tax asset adjustment due to change in enacted tax rate |  |  | $ 0 | $ 22,630,000 | $ 0 |
Provision (benefit) for income taxes |  |  | 569,000 | 66,294,000 | (126,000) |
Undistributed earnings (losses) of foreign subsidiaries | $ (19,700,000) |  | 200,000 | (19,700,000) | $ (8,400,000) |
Deferred tax assets, valuation allowance | $ 62,174,000 |  | $ 65,948,000 | 62,174,000 |  |
Federal tax rate | 21.00% | 34.00% | 21.00% |  | 34.00% |
Unrecognized tax benefits | $ 3,980,000 |  | $ 5,033,000 | 3,980,000 | $ 3,331,000 | $ 2,881,000
Accrued penalties and interest | $ 0 |  | 0 | $ 0 | $ 0 |
Internal Revenue Service (IRS) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Research tax credit carryforwards |  |  | 10,100,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 80,000,000 |  |  |
Research tax credit carryforwards |  |  | 11,500,000 |  |  |
Tax Year 2019 | Internal Revenue Service (IRS) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 88,600,000 |  |  |
Tax Years Prior To 2019 | Internal Revenue Service (IRS) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 156,400,000 |  |  |

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