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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Operating loss carryforwards	$ 33,700
Deferred research and development credit carryforwards	3,739
Minimum tax credit carryforwards	31	$ 123
Carryforwards indefinitely	$ 4,500
Maximum percentage of taxable income offset by carryforward allowed	80.00%
Decrease in valuation allowance	$ 14,849
Unrecognized tax benefits	856	$ 1,435	$ 1,174
Interest and penalties	$ 0
Minimum
Income Tax Examination [Line Items]
Carryforwards expiration date	2020
Maximum
Income Tax Examination [Line Items]
Carryforwards expiration date	2038

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