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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Outstanding Warrants The following equity classified warrants to purchase common stock were outstanding as of June 30, 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
Common stock warrants (Exchange Warrants)804,9510.001June 22, 2021None
1,231,778