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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | $ 112,531 | $ 137,394 | $ 276,583
Accumulated gross unrealized gain, before tax | 60 | 154 |
Accumulated gross unrealized loss, before tax | 0 | (341) |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 161,449 | 195,763 |
Cash, cash equivalents and debt securities available-for-sale | 161,509 | 195,576 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accumulated gross unrealized gain, before tax | 17 | 116 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 112,959 | 137,990 |
Cash, cash equivalents and debt securities available-for-sale | 112,976 | 138,106 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 48,490 | 57,773 |
Accumulated gross unrealized gain, before tax | 43 | 38 |
Accumulated gross unrealized loss, before tax | 0 | (341) |
Debt securities, available-for-sale | 48,533 | 57,470 |
Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 39,070 | 21,002 |
Cash and cash equivalents, fair value disclosure | 39,070 | 21,002 |
Money market funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 67,712 | 110,796 |
Cash and cash equivalents, fair value disclosure | 67,712 | 110,796 |
Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 6,177 | 6,192 |
Accumulated gross unrealized gain, before tax | 17 | 116 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Debt securities, available-for-sale | 6,194 | 6,308 |
Certificate of deposit | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 8,641 | 8,641 |
Cash and cash equivalents, fair value disclosure | 8,641 | 8,641 |
Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 17,656 | 14,979 |
Accumulated gross unrealized gain, before tax | 42 | 6 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Debt securities, available-for-sale | 17,698 | 14,985 |
Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 22,193 | 34,153 |
Accumulated gross unrealized gain, before tax | 1 | 32 |
Accumulated gross unrealized loss, before tax | 0 | (341) |
Debt securities, available-for-sale | 22,194 | 33,844 |
Cash and Cash Equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 112,531 | 137,394 |
Cash and Cash Equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 106,782 | 131,798 |
Cash and Cash Equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 5,749 | 5,596 |
Cash and Cash Equivalents | Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 39,070 | 21,002 |
Cash and Cash Equivalents | Money market funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 67,712 | 110,796 |
Cash and Cash Equivalents | Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 700 | 5,596 |
Cash and Cash Equivalents | Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 5,049 | 0 |
Restricted Cash (Current & Non-current) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 8,641 | 19,017 |
Restricted Cash (Current & Non-current) | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 0 | 10,376 |
Restricted Cash (Current & Non-current) | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 8,641 | 8,641 |
Restricted Cash (Current & Non-current) | Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 0 | 10,376 |
Restricted Cash (Current & Non-current) | Certificate of deposit | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 8,641 | 8,641 |
Short-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 33,458 |
Cash, cash equivalents and debt securities available-for-sale | 40,337 |  |
Short-Term Investments | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 6,194 | 0 |
Short-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 34,143 | 33,458 |
Short-Term Investments | Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 6,194 | 0 |
Short-Term Investments | Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 16,998 | 9,389 |
Short-Term Investments | Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 17,145 | 24,069 |
Long-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 16,083 |
Cash, cash equivalents and debt securities available-for-sale | 0 |  |
Long-Term Investments | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 | 6,308 |
Long-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 | 9,775 |
Long-Term Investments | Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 | 6,308 |
Long-Term Investments | Certificate of deposit | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 0 |  |
Long-Term Investments | Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | $ 0 | $ 9,775 |

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