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Warrants to Purchase Common or Preferred Stock - (Tables)
12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Schedule of Outstanding Warrants
The following warrants to purchase common stock were outstanding as of December 31, 2019:
SharesExercise PriceIssuance dateExpiration date
Common stock warrants282,402$1.84  January 19, 2016January 19, 2026
Common stock warrants74,0181.84  March 31, 2016March 31, 2026
Common stock warrants1311.84  April 1, 2016April 1, 2026
Common stock warrants (1)83,77814.32  September 8, 2017September 8, 2024
Common stock warrants (1)20,94414.32  December 7, 2018December 7, 2025
461,273
(1) Prior to the conversion upon IPO, the remaining warrants were for the purchase of Series F redeemable convertible preferred stock.