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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | $ 102,989 | $ 112,531 | $ 121,848
Accumulated gross unrealized gain, before tax | 18 | 60 |
Accumulated gross unrealized loss, before tax | (6) | 0 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 166,470 | 161,449 |
Cash, cash equivalents and debt securities available-for-sale | 166,482 | 161,509 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accumulated gross unrealized gain, before tax | 0 | 17 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 101,589 | 112,959 |
Cash, cash equivalents and debt securities available-for-sale | 101,589 | 112,976 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 64,881 | 48,490 |
Accumulated gross unrealized gain, before tax | 18 | 43 |
Accumulated gross unrealized loss, before tax | (6) | 0 |
Debt securities, available-for-sale | 64,893 | 48,533 |
Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 43,131 | 39,070 |
Cash and cash equivalents, fair value | 43,131 | 39,070 |
Money market funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 58,458 | 67,712 |
Cash and cash equivalents, fair value | 58,458 | 67,712 |
Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost |  | 6,177 |
Accumulated gross unrealized gain, before tax |  | 17 |
Accumulated gross unrealized loss, before tax |  | 0 |
Debt securities, available-for-sale |  | 6,194 |
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 | 8,641 | 8,641 |
Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 27,412 | 17,656 |
Accumulated gross unrealized gain, before tax | 1 | 42 |
Accumulated gross unrealized loss, before tax | (1) | 0 |
Debt securities, available-for-sale | 27,412 | 17,698 |
Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 28,828 | 22,193 |
Accumulated gross unrealized gain, before tax | 17 | 1 |
Accumulated gross unrealized loss, before tax | (5) | 0 |
Debt securities, available-for-sale | 28,840 | 22,194 |
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 | 102,989 | 112,531 |
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 | 101,589 | 106,782 |
Cash and Cash Equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 1,400 | 5,749 |
Cash and Cash Equivalents | Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 43,131 | 39,070 |
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 | 58,458 | 67,712 |
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 | 1,400 | 700 |
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 | 0 | 5,049 |
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 | 8,641 |
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 | 0 |
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 | 0 |
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] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 44,607 | 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 | 0 | 6,194 |
Short-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 44,607 | 34,143 |
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 |
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 | 26,012 | 16,998 |
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 | 18,595 | 17,145 |
Long-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 10,245 | 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 | 0 |
Long-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 10,245 | 0 |
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 |
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 | $ 10,245 | $ 0 |

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