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Stockholders' Equity
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Common Stock
Shelf Registration Statement
On November 17, 2023, the Company filed a registration statement on Form S-3, as amended (the 2023 Shelf Registration Statement), covering the offering, from time to time, of up to $150.0 million of common stock, preferred stock, debt securities, warrants and units. The 2023 Shelf Registration Statement became effective on November 29, 2023, and all $150.0 million remain available for sale as of March 31, 2024.
At The Market Sales Agreement
On September 15, 2022, the Company entered into a sales agreement, as amended on November 17, 2023 (the Sales Agreement) with Cowen and Company, LLC, as sales agent, pursuant to which the Company may offer and sell, from time to time, shares of Company common stock having an aggregate offering price of up to $50.0 million. The Company is not obligated to sell any shares of Company common stock in the offering. As of March 31, 2024, the Company has not sold any shares of its common stock pursuant to the Sales Agreement.
Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of March 31, 2024:
SharesExercise PriceIssuance dateExpiration date
Common stock warrants237,169$1.84 January 19, 2016January 19, 2026
Common stock warrants67,086$1.84 March 31, 2016March 31, 2026
Common stock warrants131$1.84 April 1, 2016April 1, 2026
Common stock warrants83,778$14.32 September 7, 2017September 7, 2024
Common stock warrants20,944$14.32 December 7, 2018December 7, 2025
Common stock warrants804,951$0.001 June 22, 2021None
1,214,059
During the three months ended March 31, 2024, no warrants to purchase common stock were exercised.