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FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 28,325 | $ 31,703
Accumulated gross unrealized gain, before tax | 12 | 10
Accumulated gross unrealized loss, before tax | (306) | (464)
Debt securities, available-for-sale | 86,507 | 120,559
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 115,126 | 152,716
Cash, cash equivalents and debt securities available-for-sale | 114,832 | 152,262
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 28,325 | 31,703
Cash and cash equivalents, fair value | 28,325 | 31,703
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 86,801 | 121,013
Accumulated gross unrealized gain, before tax | 12 | 10
Accumulated gross unrealized loss, before tax | (306) | (464)
Debt securities, available-for-sale | 86,507 | 120,559
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost |  | 13,254
Accumulated gross unrealized gain, before tax |  | 0
Accumulated gross unrealized loss, before tax |  | (8)
Debt securities, available-for-sale |  | 13,246
Corporate debt | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 59,480 | 70,631
Accumulated gross unrealized gain, before tax | 6 | 6
Accumulated gross unrealized loss, before tax | (222) | (296)
Debt securities, available-for-sale | 59,264 | 70,341
Municipal securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 5,504 | 3,385
Accumulated gross unrealized gain, before tax | 1 | 3
Accumulated gross unrealized loss, before tax | (4) | (1)
Debt securities, available-for-sale | 5,501 | 3,387
Asset backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 17,577 | 27,063
Accumulated gross unrealized gain, before tax | 5 | 1
Accumulated gross unrealized loss, before tax | (50) | (119)
Debt securities, available-for-sale | 17,532 | 26,945
Agency bond | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 4,240 | 4,183
Accumulated gross unrealized gain, before tax | 0 | 0
Accumulated gross unrealized loss, before tax | (30) | (35)
Debt securities, available-for-sale | 4,210 | 4,148
International government securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost |  | 2,497
Accumulated gross unrealized gain, before tax |  | 0
Accumulated gross unrealized loss, before tax |  | (5)
Debt securities, available-for-sale |  | 2,492
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 22,005 | 16,499
Cash and cash equivalents, fair value | 22,005 | 16,499
Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 6,320 | 15,204
Cash and cash equivalents, fair value | $ 6,320 | $ 15,204

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