Subsequent Events	9 Months Ended
Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events Series D-1 Convertible Preferred Stock The holders of the Series D Preferred had an option to purchase up to 8,973,261 shares of Series D-1 Preferred at a price of $11.98 per share. In October 2020, the investors exercised their option in full resulting in the issuance of 8,973,261 shares of Series D-1 Preferred at a purchase price of $11.98 per share for aggregate gross proceeds of $107,500. Roche License Agreement In October 2020, the Company entered into a license agreement, (the “Roche License Agreement”) with F. Hoffmann-La Roche Ltd and Genentech, Inc. (collectively “Roche”), granting Roche an exclusive license to develop and commercialize AT-527 outside of the United States for all indications other than HCV. The Company is responsible for completing certain ongoing non-clinical and clinical activities at its own expense and supplying certain clinical trial material under the Roche License Agreement. The parties will work collaboratively on a global development plan intended to support regulatory approval and will share joint development costs equally. In connection with the Roche License Agreement, Roche paid the Company an upfront payment of $350,000. The License Agreement further provides that Roche is obligated to pay the Company up to an additional $330,000 in the aggregate upon the achievement of certain development and regulatory milestone events; up to an additional $320,000 in the aggregate upon the achievement of certain sales based milestone events and tiered royalties based on annual net sales of the products covered by the Roche License Agreement, ranging between low double-digit and mid-twenties, subject to certain adjustments and limitations. Roche has the right to terminate the Roche License Agreement for convenience pursuant to the terms of the agreement. In connection with the Roche License Agreement, the Company became obligated to pay a $7,000 fee to a financial advisor for their services. The fee was paid in December 2020. Initial Public Offering In November 2020, the Company completed its IPO and issued 14,375,000 shares of its common stock, including the exercise in full of the underwriters’ option to purchase up to 1,875,000 shares at $24.00 per share for aggregate gross proceeds of $345,000 before deducting underwriting discounts and commissions of $24,150 and offering expenses of approximately $3,200. In connection with the IPO, all shares of Series A, B, C, D and D-1 Preferred converted into 57,932,090 shares of common stock. In addition, the Company filed a restated certificate of incorporation to increase the authorized number of shares of common stock to 300,000,000 shares and authorize 10,000,000 shares of undesignated preferred stock that may be issued from time to time by the Company’s board of directors in one or more series. 2020 Plans In October 2020, the Company’s shareholders approved the Company’s 2020 Incentive Award Plan (the “2020 Plan”), which became effective on October 29, 2020. The 2020 Plan provides for the issuance of up to 7,924,000 shares of common stock. In October 2020, the Company’s shareholders approved the 2020 Employee Stock Purchase Plan (the “ESPP”), which became effective on October 29, 2020. The ESPP provides for the issuance of up to 1,187,000 shares of common stock.

Subsequent Events

9 Months Ended

Sep. 30, 2020

13. Subsequent Events

Series D-1 Convertible Preferred Stock

The holders of the Series D Preferred had an option to purchase up to 8,973,261 shares of Series D-1 Preferred at a price of $11.98 per share. In October 2020, the investors exercised their option in full resulting in the issuance of 8,973,261 shares of Series D-1 Preferred at a purchase price of $11.98 per share for aggregate gross proceeds of $107,500.

Roche License Agreement

In October 2020, the Company entered into a license agreement, (the “Roche License Agreement”) with F. Hoffmann-La Roche Ltd and Genentech, Inc. (collectively “Roche”), granting Roche an exclusive license to develop and commercialize AT-527 outside of the United States for all indications other than HCV.

The Company is responsible for completing certain ongoing non-clinical and clinical activities at its own expense and supplying certain clinical trial material under the Roche License Agreement. The parties will work collaboratively on a global development plan intended to support regulatory approval and will share joint development costs equally.

In connection with the Roche License Agreement, Roche paid the Company an upfront payment of $350,000. The License Agreement further provides that Roche is obligated to pay the Company up to an additional $330,000 in the aggregate upon the achievement of certain development and regulatory milestone events; up to an additional $320,000 in the aggregate upon the achievement of certain sales based milestone events and tiered royalties based on annual net sales of the products covered by the Roche License Agreement, ranging between low double-digit and mid-twenties, subject to certain adjustments and limitations. Roche has the right to terminate the Roche License Agreement for convenience pursuant to the terms of the agreement.

In connection with the Roche License Agreement, the Company became obligated to pay a $7,000 fee to a financial advisor for their services. The fee was paid in December 2020.

Initial Public Offering

In November 2020, the Company completed its IPO and issued 14,375,000 shares of its common stock, including the exercise in full of the underwriters’ option to purchase up to 1,875,000 shares at $24.00 per share for aggregate gross proceeds of $345,000 before deducting underwriting discounts and commissions of $24,150 and offering expenses of approximately $3,200. In connection with the IPO, all shares of Series A, B, C, D and D-1 Preferred converted into 57,932,090 shares of common stock. In addition, the Company filed a restated certificate of incorporation to increase the authorized number of shares of common stock to 300,000,000 shares and authorize 10,000,000 shares of undesignated preferred stock that may be issued from time to time by the Company’s board of directors in one or more series.

2020 Plans

In October 2020, the Company’s shareholders approved the Company’s 2020 Incentive Award Plan (the “2020 Plan”), which became effective on October 29, 2020. The 2020 Plan provides for the issuance of up to 7,924,000 shares of common stock.

In October 2020, the Company’s shareholders approved the 2020 Employee Stock Purchase Plan (the “ESPP”), which became effective on October 29, 2020. The ESPP provides for the issuance of up to 1,187,000 shares of common stock.