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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Available-for-sale Securities Included in Cash Equivalents | Available-for-sale investments included in cash equivalents at the end of each period were as follows (in thousands):
| March 31, 2019 |  | December 31, 2018
| Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value |  | Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value
Municipal bonds and notes | $ | 4,188 |  |  | $ | — |  |  | $ | 4,188 |  |  | $ | 12,149 |  |  | $ | (7 | ) |  | $ | 12,142 |
Corporate debt securities | 48,535 |  |  | (16 | ) |  | 48,519 |  |  | 51,862 |  |  | (26 | ) |  | 51,836 |
Financial institution instruments | 33,270 |  |  | — |  |  | 33,270 |  |  | 21,352 |  |  | — |  |  | 21,352 |
Total available-for-sale investments | $ | 85,993 |  |  | $ | (16 | ) |  | $ | 85,977 |  |  | $ | 85,363 |  |  | $ | (33 | ) |  | $ | 85,330 |
Schedule of Company's Hierarchy for Assets Measured at Fair Value on Recurring Basis | The tables below present the Company’s hierarchy for assets measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018.
| March 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Amounts included in cash and cash equivalents | $ | 85,977 |  |  | $ | — |  |  | $ | — |  |  | $ | 85,977 |
Total assets measured at fair value on a recurring basis | $ | 85,977 |  |  | $ | — |  |  | $ | — |  |  | $ | 85,977 |
| December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Amounts included in cash and cash equivalents | $ | 85,330 |  |  | $ | — |  |  | $ | — |  |  | $ | 85,330 |
Total assets measured at fair value on a recurring basis | $ | 85,330 |  |  | $ | — |  |  | $ | — |  |  | $ | 85,330 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&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 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: 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=99377789&loc=d3e19207-110258 + Details
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