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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 420,782 $ 362,360
Section 174 R&E capitalization 87,721 50,571
Research and development credits 56,610 40,954
Interest expense 39,859 19,974
Stock-based compensation 22,554 20,927
Capital loss 16,192 0
Operating lease liabilities 11,605 12,986
Valuation discount 9,095 0
Investments 7,544 5,886
Amortization 3,715 3,969
Accrued compensation 3,262 3,398
Other accrued liabilities 2,944 1,640
Other 839 698
Total deferred tax assets 682,722 523,363
Deferred tax liabilities:    
Debt discount (23,365) (16,527)
Operating lease right-of-use assets (9,380) (11,747)
Depreciation (1,533) (3,300)
Indefinite-lived intangible assets (148) (192)
Total deferred tax liabilities (34,426) (31,766)
Net deferred tax assets 648,296 491,597
Valuation allowance (648,444) (491,755)
Net deferred tax liabilities $ (148) $ (158)