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Balance Sheet Account Details - Narrative (Details) shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) position shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) shares | Jan. 31, 2010 agreement
Schedule of Investments |  |  |  |
Number of positions in an unrealized loss position | position | 31 |  |  |
Unrealized losses | $ 14,000 | $ 162,000 |  |
Investment in Viking common stock | 32,200,000 | 63,100,000 |  |
Gain (loss) from short-term investments | 46,365,000 | 28,540,000 | $ (5,263,000) |
Depreciation expense | $ 2,900,000 | 3,800,000 | 2,400,000 |
Finite-lived intangible asset, useful life (in years) | 20 years |  |  |
Amortization of intangibles | $ 33,654,000 | 34,237,000 | 34,222,000 |
Estimated amortization expense for 2024 | 32,800,000 |  |  |
Estimated amortization expense for 2025 | 32,800,000 |  |  |
Estimated amortization expense for 2026 | 32,800,000 |  |  |
Estimated amortization expense for 2027 | 32,800,000 |  |  |
Estimated amortization expense for 2028 | 32,800,000 |  |  |
Impairment loss of commercial license rights | $ 0 | $ 0 | $ 0 |
Number of CVR agreements | agreement |  |  |  | 4
Viking Therapeutics, Inc. |  |  |  |
Schedule of Investments |  |  |  |
Ownership interest (as a percent) | 1.70% |  |  |
Stock sold of equity method investee (in shares) | shares | 5.0 |  | 0.6 |
Gain (loss) from short-term investments | $ 44,400,000 |  | $ 3,600,000 |
Minimum |  |  |  |
Schedule of Investments |  |  |  |
Property and equipment, useful life (in years) | 1 year |  |  |
Maximum |  |  |  |
Schedule of Investments |  |  |  |
Property and equipment, useful life (in years) | 9 years |  |  |

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