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Stockholders' Equity
 9 Months Ended
Sep. 30, 2023
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders’ Equity
Sales of Common Stock
On March 1, 2021, the Company filed an automatic shelf registration statement on Form S-3 with the SEC. This shelf registration statement became effective automatically upon filing and allows the Company to sell an indeterminate number of securities, including common stock, preferred stock, depositary shares, purchase contracts, warrants, debt securities, and units, from time to time at prices and on terms to be determined at the time of sale.
On November 19, 2021, concurrent with the Company entering into the 2021 RPI Royalty Purchase Agreement, the Company and RPI entered into the Common Stock Purchase Agreement, pursuant to which the Company issued 3,846 shares of the Company’s common stock to RPI for an aggregate purchase price of $50,000, at a price of $13.00 per share, calculated based on the 20-day volume weighted average price. The $13.00 per share price represented a premium of $1.11 over the closing price of $11.89 of the Company’s common stock on November 19, 2021. The premium of $4,269 paid by RPI on the purchase of the Company’s common stock has been deferred and is being amortized as a component of interest expense of the 2021 RPI royalty financing obligation.
Shares Reserved for Future Issuance of Common Stock
The Company had reserved shares of common stock for issuance as follows (in thousands):
As of September 30, 2023As of December 31, 2022
Shares reserved for exercises of outstanding stock options35,160 36,520 
Shares reserved for vesting of restricted stock units4,589 4,750 
Shares reserved for exercises of warrants15,023 15,023 
Shares reserved for future issuance under the Stock Incentive Plan11,934 4,206 
Shares reserved for future issuance under the Inducement Equity Incentive Plan 200 947 
Shares reserved for future issuance under the Employee Stock Purchase Plan5,454 5,792 
Total shares reserved for future issuance72,360 67,238