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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2007 $ / shares | Jan. 31, 2010 right
Basis of Presentation |  |  |  |  |
Number of reportable segment | segment | 1 |  |  |  |
Increase (decrease) of allowance for credit loss | $ 200,000 | $ (300,000) | $ 10,000.00 |  |
Write-downs related to obsolete inventory | 200,000 | 1,100,000 | $ 0 |  |
Inventory | 23,969,000 | 13,294,000 |  |  |
Revenue recognized | $ 100,000 | 400,000 |  |  |
Dividend declared (in USD per share) | $ / shares |  |  |  | $ 2.50 |
Dividend yield |  |  |  |  |
Basis of Presentation |  |  |  |  |
Measurement input (as a percent) | 0 |  |  |  |
PSUs |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |
Employee Stock Option | 2002 Stock Incentive Plan |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award expiration period (in years) | 10 years |  |  |  |
Employee Stock Option | 2002 Stock Incentive Plan | Vest 1/8 on the six month anniversary of the date of grant |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting period (in years) | 6 months |  |  |  |
Award vesting right (as a percent) | 12.50% |  |  |  |
Employee Stock Option | 2002 Stock Incentive Plan | Vest 1/48 each month for forty-two months |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting period (in years) | 42 months |  |  |  |
Award vesting right (as a percent) | 2.08% |  |  |  |
RSUs and PSUs |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |
Metabasis Therapeutics |  |  |  |  |
Basis of Presentation |  |  |  |  |
Number of contingent value rights | right |  |  |  |  | 4
Minimum |  |  |  |  |
Basis of Presentation |  |  |  |  |
Property and equipment, useful life (in years) | 1 year |  |  |  |
Minimum | PSUs |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting right (as a percent) | 0.00% |  |  |  |
Maximum |  |  |  |  |
Basis of Presentation |  |  |  |  |
Property and equipment, useful life (in years) | 9 years |  |  |  |
Maximum | PSUs |  |  |  |  |
Basis of Presentation |  |  |  |  |
Award vesting right (as a percent) | 200.00% |  |  |  |
Captisol |  |  |  |  |
Basis of Presentation |  |  |  |  |
Inventory | $ 4,600,000 | $ 5,900,000 |  |  |

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