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Stockholders' Equity
3 Months Ended
Mar. 31, 2024
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders' equity
Common Stock
Gilead Stock Purchase Agreement
On January 29, 2024, under the Third Stock Purchase Agreement Amendment, Gilead purchased 15.2 million shares of our common stock at a price of $21.00 per share for total gross proceeds of $320 million. Of the $320 million equity investment, $87 million was determined to be a premium on the purchase of common stock and allocated to the performance obligations created by the Third Gilead Collaboration Agreement Amendment, see Note 5, Revenues. Net proceeds from Gilead's equity investment were $228 million after allocating the premium and deducting direct offering expenses of $5 million