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Stockholders' Equity
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Common Stock
On November 10, 2020, the Company filed a registration statement on Form S-3 (the 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, which Shelf Registration Statement became effective on November 19, 2020.
On March 25, 2021, the Company completed a public offering of 4,255,000 shares of its common stock at a public offering price of $16.25 per share. Net proceeds from the offering were approximately $64.7 million, after deducting underwriting discounts and commissions and offering expenses of $4.4 million. The shares were registered pursuant to the Company's Shelf Registration Statement discussed above.
Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of March 31, 2021:
SharesExercise PriceIssuance dateExpiration date
Common stock warrants252,798$1.84 January 19, 2016January 19, 2026
Common stock warrants69,1761.84March 31, 2016March 31, 2026
Common stock warrants1311.84April 1, 2016April 1, 2026
Common stock warrants83,77814.32September 7, 2017September 7, 2024
Common stock warrants20,94414.32December 7, 2018December 7, 2025
426,827