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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Federal and state net operating loss carryforward | $ 550,272 | $ 479,134
Foreign net operating loss carryforward | 0 | 5,752
Research tax credits | 51,878 | 45,560
Lease liability | 25,207 | 27,625
Deferred revenue | 266,392 | 195,049
Inventory reserve | 79,386 | 213,076
Allowance for sales returns | 20,756 | 0
Non-cash stock-based compensation | 30,727 | 27,599
Capitalized research costs | 132,500 | 49,309
Foreign tax credit carryforward | 18,679 | 0
Other | 10,996 | 13,695
Gross deferred tax assets | 1,186,793 | 1,056,799
Valuation allowance | (1,128,941) | (1,020,123)
Total deferred tax assets | 57,852 | 36,676
Deferred tax liabilities: |  |
ROU assets | (41,456) | (23,330)
Fixed assets | (17,160) | (11,587)
Intangibles | (1,279) | (1,055)
Other |  | (704)
Total deferred tax liabilities | (59,895) | (36,676)
Net deferred tax assets (liabilities) | $ 2,043 |
Net deferred tax assets (liabilities) |  | $ 0

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