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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Schedule of Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of March 31, 2022:
SharesExercise PriceIssuance dateExpiration date
Common stock warrants237,169$1.84 January 19, 2016January 19, 2026
Common stock warrants67,0861.84 March 31, 2016March 31, 2026
Common stock warrants1311.84 April 1, 2016April 1, 2026
Common stock warrants83,77814.32 September 7, 2017September 7, 2024
Common stock warrants20,94414.32 December 7, 2018December 7, 2025
Common stock warrants (Exchange Warrants)804,9510.001 June 22, 2021None
1,214,059
During the three months ended March 31, 2022, no warrants to purchase common stock was exercised.