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Business Combination - Total Purchase Consideration (Details) - Antares Pharma, Inc - USD ($) $ in Thousands |  | 12 Months Ended
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May 24, 2022 | Dec. 31, 2022
Business Acquisition [Line Items] |  |
Cash consideration for Antares shares outstanding as of May 24, 2022 | $ 956,886 |
Consideration for Antares equity compensation awards | 45,828 |
Consideration for seller transaction costs paid by Halozyme | 22,906 |
Consideration related to Antares closing indebtedness settled by Halozyme | 19,683 |
Cash consideration related to cash bonus awards paid by Halozyme | 365 |
Total purchase consideration | 1,045,668 |
Unvested equity awards attributable to the post-combination period |  | $ 8,700
Equity Compensation Awards, Vested |  |
Business Acquisition [Line Items] |  |
Consideration for Antares equity compensation awards | 32,200 |
Equity Compensation Awards, Unvested |  |
Business Acquisition [Line Items] |  |
Consideration for Antares equity compensation awards | $ 13,600 |

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