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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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