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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Amortization and depreciation | $ 64,919 | $ 64,111
Net operating loss carryforwards | 98,702 | 86,547
Tax credits | 15,375 | 14,411
Stock-based compensation | 6,946 | 5,244
Deferred royalty obligation | 4,907 | 2,577
Other | 6,707 | 4,909
Gross deferred tax assets | 197,556 | 177,799
Valuation allowance | (196,197) | (175,670)
Deferred tax assets net of valuation allowance | 1,359 | 2,129
Deferred tax liabilities: |  |
Right-of-use asset | (1,359) | (2,129)
Other | 0 | 0
Net deferred tax assets | $ 0 | $ 0

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