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INCOME TAXES - Reconciliation of Taxes Provided to Federal Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Tax benefit at statutory rate |  | $ (36,163) | $ (18,441) | $ (11,790)
State income taxes before valuation allowance, net of federal effect |  | (7,680) | (3,612) | (1,042)
Foreign tax rate differential |  | (1,422) | 71 | (1,188)
Research and development credits |  | (3,892) | (3,744) | (2,189)
Change in valuation allowance |  | 51,741 | 30,558 | 56,663
Compensation/option differences |  | (6,584) | (7,277) | (4,965)
Non-deductible compensation |  | 3,017 | 1,200 | 1,132
Tax Act rate change impact | $ 23,000 | 0 | 0 | 22,630
Foreign loss not benefited |  | 107 | 159 | 6,847
Other |  | 1,708 | 1,655 | 196
Total income tax provision (benefit) |  | $ 832 | $ 569 | $ 66,294

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