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Warrants (Tables)
3 Months Ended
Mar. 31, 2021
Warrants and Rights Note Disclosure [Abstract]  
Components of Warrants Outstanding
As of March 31, 2021, outstanding warrants to purchase common stock were:
Classified asOriginal TermExercise PriceNumber of Shares Underlying Warrants
Original issue date:
April 2016Liability7 years$1.12 6,264 
6,264