INCOME TAXES - Summary of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 303,729	$ 295,985
Research and development credit	42,031	35,665
Noncash compensation	10,325	32,356
Disallowed interest	3,882	2,434
Deferred Tax Assets, Capital Loss Carryforwards	39,411	0
Other	985	1,006
Capitalized R&D Expenses	39,411	0
Deferred tax asset, excluding valuation allowance	400,363	367,446
Less valuation allowance	400,363	367,446
Net deferred tax assets	$ 0	$ 0

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible disallowed interest.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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