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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Mar. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Cash, cash equivalents and available-for-sale investments were (in thousands):
As of March 31, 2020 |  | Amortized Costs |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Cash |  | $ | 21,002 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,002 |  |  | $ | 21,002 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 110,796 |  |  | — |  |  | — |  |  | 110,796 |  |  | 110,796 |  |  | — |  |  | — |
Treasuries |  | 6,192 |  |  | 116 |  |  | — |  |  | 6,308 |  |  | — |  |  | — |  |  | 6,308 |
Subtotal |  | 137,990 |  |  | 116 |  |  | — |  |  | 138,106 |  |  | 131,798 |  |  | — |  |  | 6,308 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 14,979 |  |  | 6 |  |  | — |  |  | 14,985 |  |  | 5,596 |  |  | 9,389 |  |  | — |
Corporate debt |  | 34,153 |  |  | 32 |  |  | (341 | ) |  | 33,844 |  |  | — |  |  | 24,069 |  |  | 9,775 |
Subtotal |  | 49,132 |  |  | 38 |  |  | (341 | ) |  | 48,829 |  |  | 5,596 |  |  | 33,458 |  |  | 9,775 |
Total assets |  | $ | 187,122 |  |  | $ | 154 |  |  | $ | (341 | ) |  | $ | 186,935 |  |  | $ | 137,394 |  |  | $ | 33,458 |  |  | $ | 16,083 |
As of March 31, 2019 |  | Amortized Costs |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments
Cash |  | $ | 25,364 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,364 |  |  | $ | 25,364 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 251,219 |  |  | — |  |  | — |  |  | 251,219 |  |  | 251,219 |  |  | — |
Subtotal |  | 276,583 |  |  | — |  |  | — |  |  | 276,583 |  |  | 276,583 |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  | 46,516 |  |  | 51 |  |  | (29 | ) |  | 46,538 |  |  | — |  |  | 46,538 |
Municipal securities |  | 5,511 |  |  | 17 |  |  | — |  |  | 5,528 |  |  | — |  |  | 5,528 |
Asset backed securities |  | 13,596 |  |  | 9 |  |  | (17 | ) |  | 13,588 |  |  | — |  |  | 13,588 |
Agency bond |  | 4,260 |  |  | — |  |  | (15 | ) |  | 4,245 |  |  | — |  |  | 4,245 |
Subtotal |  | 69,883 |  |  | 77 |  |  | (61 | ) |  | 69,899 |  |  | — |  |  | 69,899 |
Total assets |  | $ | 346,466 |  |  | $ | 77 |  |  | $ | (61 | ) |  | $ | 346,482 |  |  | $ | 276,583 |  |  | $ | 69,899 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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