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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Available-for-sale Securities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 24,161 |
Gross unrealized gains | 23 |
Gross unrealized losses | (48) |
Aggregate Estimated Fair Value | $ 24,136 |
Available-for-sale securities in unrealized gain positions | security | 53 |
Available-for-sale securities in unrealized loss positions | security | 18 |
Unrealized losses | $ 50 |
Unrealized losses individually |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses | 35 |
Certificates of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,828 |
Gross unrealized gains | 11 |
Gross unrealized losses | 0 |
Aggregate Estimated Fair Value | 8,839 |
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,883 | $ 4,334
Gross unrealized gains | 6 | 21
Gross unrealized losses | (9) | (99)
Aggregate Estimated Fair Value | 6,880 | $ 4,256
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,383 |
Gross unrealized gains | 6 |
Gross unrealized losses | (7) |
Aggregate Estimated Fair Value | 6,382 |
US Government Agencies Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,000 |
Gross unrealized gains | 0 |
Gross unrealized losses | 0 |
Aggregate Estimated Fair Value | 1,000 |
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,067 |
Gross unrealized gains | 0 |
Gross unrealized losses | (32) |
Aggregate Estimated Fair Value | $ 1,035 |

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- Definition This item represents the current level of subordination of the entity's receipt of consideration should the assets underlying the security be liquidated when the level of subordination was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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