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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
The Company's amended and restated certificate of incorporation authorizes 125,000,000 shares of common stock, and 5,000,000 shares of undesignated preferred stock, both with a par value of $0.01 per share. There were no shares of undesignated preferred stock issued or outstanding as of December 31, 2021 or 2020.
In December 2019, the Company entered into a sales agreement with an agent to sell, from time to time, shares of its common stock in amounts of up to $50.0 million through an “at the market offering” (ATM Offering) as defined in Rule 415 under the Securities Act of 1933, as amended. This agreement was amended in June 2020 to increase the maximum amount of the offering to $175.0 million. The shares that may be sold under the sales agreement would be issued and sold pursuant to the Company's shelf registration statement on Form S-3 that was filed with the Securities and Exchange Commission (SEC) on December 23, 2019. During the year ended December 31, 2020, the Company sold 6,612,815 shares of common stock at a weighted average price per share of $26.46, resulting in net proceeds of approximately $170.5 million, net of underwriting discounts and commissions and other offering expenses.
In November 2020, the Company entered into a sales agreement (Sales Agreement) with an agent to sell, from time to time, shares of its common stock having an aggregate sales price of up to $100.0 million through an ATM Offering. The shares that were sold under the Sales Agreement were issued and sold pursuant to the Company's shelf registration statement on Form S-3 that was filed with the SEC on November 4, 2020. During the year ended December 31, 2021, the Company sold 3,622,186 shares of common stock at a weighted average price per share of $27.60, resulting in net proceeds of approximately $98.2 million, net of underwriting discounts and commissions and other offering expenses.
In April 2021, the Company entered into Amendment No. 1 to the Sales Agreement which increases the amount of the Company’s common stock that can be sold by the Company through its agent under the ATM Offering, from an aggregate offering price of up to $100.0 million to an aggregate offering price of up to $300.0 million. During the year ended December 31, 2021, the Company did not sell any shares of common stock related to Amendment No. 1 to the Sales Agreement.
As part of the consideration for the rights granted to Zai Lab US LLC under the collaboration and license agreement described more fully in Note 10, Collaboration and Other Agreements, the Company and Zai Lab US LLC entered into a separate stock purchase agreement (Stock Purchase Agreement). Under this Stock Purchase Agreement, Zai Lab US LLC paid the Company approximately $30.0 million to purchase 958,467 newly issued shares of the Company's common stock, par value $0.01, at a fixed price of $31.30 which represented a $10.4 million premium over the share price on the Stock Purchase Agreement date.