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Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisition	Note 5. Acquisitions On November 17, 2022, we completed our acquisition of 100% of the outstanding shares of Villaris Therapeutics, Inc. ("Villaris"). Villaris is an early-stage biopharma company focused on the development of novel antibody therapeutics for vitiligo. We evaluated the acquired set of activities and assets, and concluded that the acquisition of Villaris did not meet the definition of a business, as substantially all of the purchase price was concentrated in a single identifiable preclinical asset. Therefore, the transaction was accounted for as an asset acquisition. Under the terms of the acquisition agreement, we made an upfront payment of $70.3 million, which was attributed to the fair value of the preclinical asset acquired. As the preclinical asset had no alternative future use at the date of acquisition, the entire upfront payment amount was expensed to research and development expense on the consolidated statement of operations for the year ended December 31, 2022. There were no material assets or liabilities recorded on the consolidated balance sheet as part of this acquisition. Former Villaris stockholders are eligible to receive up to $310.0 million upon achievement of certain development and regulatory milestones, as well as up to an additional $1.05 billion in commercial milestones on net sales of commercialized products. We will accrue for these milestone payments in the future when it becomes probable they will be achieved.