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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | $ 106,877 | $ 137,394 | $ 184,794
Accumulated gross unrealized gain, before tax | 121 | 154 |
Accumulated gross unrealized loss, before tax | (2) | (341) |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 167,932 | 206,139 |
Cash, cash equivalents and debt securities available-for-sale | 168,051 | 205,952 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accumulated gross unrealized gain, before tax | 42 | 116 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 118,069 | 148,366 |
Cash, cash equivalents and debt securities available-for-sale | 118,111 | 148,482 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 49,863 | 57,773 |
Accumulated gross unrealized gain, before tax | 79 | 38 |
Accumulated gross unrealized loss, before tax | (2) | (341) |
Debt securities, available-for-sale | 49,940 | 57,470 |
Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 40,656 | 31,378 |
Cash and cash equivalents, fair value | 40,656 | 31,378 |
Money market funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 71,232 | 110,796 |
Cash and cash equivalents, fair value | 71,232 | 110,796 |
Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 6,181 | 6,192 |
Accumulated gross unrealized gain, before tax | 42 | 116 |
Accumulated gross unrealized loss, before tax | 0 | 0 |
Debt securities, available-for-sale | 6,223 | 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 | 8,641 | 8,641 |
Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 16,194 | 14,979 |
Accumulated gross unrealized gain, before tax | 0 | 6 |
Accumulated gross unrealized loss, before tax | (1) | 0 |
Debt securities, available-for-sale | 16,193 | 14,985 |
Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost | 25,028 | 34,153 |
Accumulated gross unrealized gain, before tax | 79 | 32 |
Accumulated gross unrealized loss, before tax | (1) | (341) |
Debt securities, available-for-sale | 25,106 | 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 | 106,877 | 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 | 104,971 | 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 | 1,906 | 5,596 |
Cash and Cash Equivalents | Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and Cash Equivalents | 33,739 | 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 | 71,232 | 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 | 1,300 | 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 | 606 |  |
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 | 15,558 | 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 | 6,917 | 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 | 6,917 | 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] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 41,738 | 33,458 |
Short-Term Investments | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 6,223 |  |
Short-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 35,515 | 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 | 6,223 |  |
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 | 14,893 | 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 | 20,622 | 24,069 |
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 | 3,878 | 16,083 |
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 | 3,878 | 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 | $ 3,878 | $ 9,775 |

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