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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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