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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Available-for-sale Securities (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 18,782
Gross Unrealized Gains	141
Gross Unrealized Losses	(117)
Aggregate Estimated Fair Value	$ 18,806
Available-for-sale securities in unrealized gain positions | security	63	26
Available-for-sales securities in unrealized loss positions | security	32	32
Unrealized losses	$ 117	$ 117
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,888
Gross Unrealized Gains	6
Gross Unrealized Losses	0
Aggregate Estimated Fair Value	5,894
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,986
Gross Unrealized Gains	58
Gross Unrealized Losses	(43)
Aggregate Estimated Fair Value	5,001
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,059	4,334
Gross Unrealized Gains	0	21
Gross Unrealized Losses	(3)	(99)
Aggregate Estimated Fair Value	3,056	4,256
US Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,262
Gross Unrealized Gains	27
Gross Unrealized Losses	(10)
Aggregate Estimated Fair Value	2,279
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,557
Gross Unrealized Gains	50
Gross Unrealized Losses	(33)
Aggregate Estimated Fair Value	1,574
Other securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,030
Gross Unrealized Gains	0
Gross Unrealized Losses	(28)
Aggregate Estimated Fair Value	1,002
Unrealized Losses Individually
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	$ 30	$ 30

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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.

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