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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of September 30, 2021:
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 nine months ended September 30, 2021, warrants to purchase common stock were exercised resulting in the issuance of 17,719 shares of the Company's common stock and cash proceeds of an immaterial amount.