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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Contractual maturities of investments as of March 31, 2019 are set forth below (in thousands):
| Estimated Fair Value
Due within one year | $ | 32,385 |
Due after one year | 37,514 |
Total | $ | 69,899 |
Cash, cash equivalents and available-for-sale investments were (in thousands):
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 |
As of March 31, 2018 |  | Amortized Costs |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments
Cash |  | $ | 16,499 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,499 |  |  | $ | 16,499 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 15,204 |  |  | — |  |  | — |  |  | 15,204 |  |  | 15,204 |  |  | — |
Subtotal |  | 31,703 |  |  | — |  |  | — |  |  | 31,703 |  |  | 31,703 |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 13,254 |  |  | — |  |  | (8 | ) |  | 13,246 |  |  | — |  |  | 13,246 |
Corporate debt |  | 70,631 |  |  | 6 |  |  | (296 | ) |  | 70,341 |  |  | — |  |  | 70,341 |
Asset backed securities |  | 3,385 |  |  | 3 |  |  | (1 | ) |  | 3,387 |  |  | — |  |  | 3,387 |
Mortgage backed securities |  | 27,063 |  |  | 1 |  |  | (119 | ) |  | 26,945 |  |  | — |  |  | 26,945 |
Agency bond |  | 4,183 |  |  | — |  |  | (35 | ) |  | 4,148 |  |  | — |  |  | 4,148 |
Subtotal |  | 121,013 |  |  | 10 |  |  | (464 | ) |  | 120,559 |  |  | — |  |  | 120,559 |
Total assets |  | $ | 152,716 |  |  | $ | 10 |  |  | $ | (464 | ) |  | $ | 152,262 |  |  | $ | 31,703 |  |  | $ | 120,559 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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