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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Federal and state net operating loss carryforwards $ 433 $ 524
Research and development credits 164 133
Share-based compensation 102 66
Capitalized research and development 100 0
Lease liability 43 41
Interest expense limitation 28 58
Debt discount on convertible notes 18 0
Accruals and reserves 3 13
Depreciation and amortization 0 1
Inventory 0 69
Other deferred tax assets 5 1
Total deferred tax assets 896 906
Deferred tax liabilities:    
Right of use assets (31) (32)
Intangible assets (15) (22)
Goodwill (5) (5)
Depreciation and amortization (3) 0
Debt discount on convertible notes 0 (60)
Website and software development costs 0 (43)
Total deferred tax liabilities (54) (162)
Net deferred tax assets before valuation allowance 842 744
Less: valuation allowance (843) (746)
Net deferred tax liabilities $ (1) $ (2)