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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Investments by Significant Category Included in Cash Equivalents | Investments by significant category included in cash equivalents at the end of each period were as follows (in thousands):
|  | September 30, 2019 |  | December 31, 2018
| Fair Value Level 1 | Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value |  | Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value
Money market funds | Level 1 | $ | 30,810 |  |  | $ | — |  |  | $ | 30,810 |  |  | $ | 3,281 |  |  | $ | — |  |  | $ | 3,281 |
Time deposits | Level 2 | 14,904 |  |  | — |  |  | 14,904 |  |  | 18,071 |  |  | — |  |  | 18,071 |
Municipal debt securities | Level 2 | 3,432 |  |  | 1 |  |  | 3,433 |  |  | 12,149 |  |  | (7 | ) |  | 12,142 |
Corporate debt securities | Level 2 | 34,266 |  |  | (11 | ) |  | 34,255 |  |  | 51,862 |  |  | (26 | ) |  | 51,836 |
Total investments |  | $ | 83,412 |  |  | $ | (10 | ) |  | $ | 83,402 |  |  | $ | 85,363 |  |  | $ | (33 | ) |  | $ | 85,330 |
1 FASB Topic 820, Fair Value Measurements, establishes a fair value hierarchy that requires the use of observable market data, when available, and prioritizes the inputs to valuation techniques used to measure fair value in the following categories: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Unobservable inputs that are not corroborated by market data.

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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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- References No definition available. + Details
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