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INCOME TAXES - Summary of Reconciliation Between Income Taxes Computed at Federal Statutory Rate and Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal income taxes at 21% for 2023 and 2022									$ (4,723)	$ (7,029)
Federal statutory income tax rate (as a percent)									21.00%	21.00%	21.00%
State income tax, net of federal benefit									$ (186)	$ (247)
Nondeductible expenses									260	415
Tax credits									(2,076)	(1,877)
Rate change									(54)	491
Change in valuation allowance									6,373	(19,684)
Reserve for uncertain tax positions									519	(10,423)
162m deferred tax asset limitation									128	82
382 NOL and tax credit limitation									0	37,513
Expired stock awards									174	1,052
Other									28	(21)
Income tax expense	$ 230	$ 149	$ 0	$ 0	$ 149	$ 0	$ 379	$ 0	$ 443	$ 272

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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