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INCOME TAXES - Reconciliation of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 435,488 $ 400,629
Research and development credits 83,922 71,526
Capitalized research and experimental expenses 63,196 34,863
Accruals and reserves 16,872 13,830
Cancellation of indebtedness income and interest expense 14,907 4,587
Share-based compensation 18,584 17,117
Operating lease liability 9,510 11,537
Total deferred tax assets 642,479 554,089
Less: Valuation allowance (525,703) (445,574)
Total deferred tax assets: 116,776 108,515
Intangibles (109,488) (98,931)
Fixed assets (548) (1,262)
Operating lease right-of-use assets (7,491) (9,157)
Total deferred tax liabilities (117,527) (109,350)
Deferred tax liabilities, net $ (751) $ (835)