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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Available-for-sale Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 25,315	$ 24,161
Gross unrealized gains	606	23
Gross unrealized losses	(2)	(48)
Aggregate Estimated Fair Value	$ 25,919	24,136
Number of available-for-sale securities in unrealized gain positions | security	69
Number of available-for-sale securities in unrealized loss positions | security	2
Unrealized losses	$ (2)
Unrealized losses individually
Debt Securities, Available-for-sale [Line Items]
Unrealized losses	(1)
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,370	8,828
Gross unrealized gains	204	11
Gross unrealized losses	0	0
Aggregate Estimated Fair Value	7,574	8,839
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,415	6,883
Gross unrealized gains	297	6
Gross unrealized losses	(1)	(9)
Aggregate Estimated Fair Value	9,711	6,880
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,531	6,383
Gross unrealized gains	103	6
Gross unrealized losses	(1)	(7)
Aggregate Estimated Fair Value	7,633	6,382
US Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500	1,000
Gross unrealized gains	1	0
Gross unrealized losses	0	0
Aggregate Estimated Fair Value	501	1,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	499	1,067
Gross unrealized gains	1	0
Gross unrealized losses	0	(32)
Aggregate Estimated Fair Value	$ 500	$ 1,035

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