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Stockholders' Equity
6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of June 30, 2020:
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 warrants (1)83,77814.32September 8, 2017September 8, 2024
Common stock warrants (1)20,94414.32December 7, 2018December 7, 2025
426,827
(1) Prior to the conversion upon IPO, the remaining warrants were for the purchase of Series F redeemable convertible preferred stock.
During the six months ended June 30, 2020, warrants to purchase common stock were exercised resulting in the issuance of 32,120 shares of the Company's common stock and cash proceeds of an immaterial amount.