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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Cash, cash equivalents, and available-for-sale investments (in thousands):
| Amortized |  | Gross Unrealized |  | Gross Unrealized |  | Estimated |  | Cash and Cash |  | Short-Term |  | Long-Term
As of June 30, 2019 | Costs |  | Gain |  | Loss |  | Fair Value |  | Equivalents |  | Investments |  | Investments
Cash | $ | 23,533 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,533 |  |  | $ | 23,533 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 240,905 |  |  | — |  |  | — |  |  | 240,905 |  |  | 240,905 |  |  | — |  |  | — |
Treasury securities | 2,910 |  |  | 2 |  |  | — |  |  | 2,912 |  |  | — |  |  | — |  |  | 2,912 |
Subtotal | 267,348 |  |  | 2 |  |  | — |  |  | 267,350 |  |  | 264,438 |  |  | — |  |  | 2,912 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | 40,128 |  |  | 122 |  |  | (3 | ) |  | 40,247 |  |  | — |  |  | 23,613 |  |  | 16,634 |
Commercial paper | 6,176 |  |  | — |  |  | (2 | ) |  | 6,174 |  |  | 4,587 |  |  | 1,587 |  |  | — |
Municipal securities | 2,098 |  |  | 23 |  |  | — |  |  | 2,121 |  |  | — |  |  | — |  |  | 2,121 |
Agency bond | 2,289 |  |  | — |  |  | (3 | ) |  | 2,286 |  |  | — |  |  | 2,286 |  |  | — |
Subtotal | 50,691 |  |  | 145 |  |  | (8 | ) |  | 50,828 |  |  | 4,587 |  |  | 27,486 |  |  | 18,755 |
Total assets | $ | 318,039 |  |  | $ | 147 |  |  | $ | (8 | ) |  | $ | 318,178 |  |  | $ | 269,025 |  |  | $ | 27,486 |  |  | $ | 21,667 |
|  | Amortized |  | Gross Unrealized |  | Gross Unrealized |  | Estimated |  | Cash and Cash |  | Short-Term
As of March 31, 2019 |  | Costs |  | Gain |  | Loss |  | Fair Value |  | Equivalents |  | 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 |
Contractual Maturity of Investments | Contractual maturities of investments as of June 30, 2019 are set forth below (in thousands):
| Estimated
| Fair Value
Due within one year | $ | 27,486 |
Due after one year | 21,667 |
Total | $ | 49,153 |

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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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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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