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Business Combination (Tables)
 6 Months Ended
Jun. 30, 2023
Business Combination and Asset Acquisition [Abstract]  
Business Acquisition Unaudited Pro Forma Financial Information
The following unaudited pro forma financial information summarizes combined results of operations of Halozyme and Antares as if the companies had been combined as of the beginning of our fiscal year 2021.
Three Months Ended
 June 30,		Six Months Ended
June 30,
2023202220232022
Total revenues$221,038 $163,376 $383,181 $322,212 
Net income (loss)74,754 60,461 114,369 96,752