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Warrants to Purchase Common or Preferred Stock - (Notes) | 9 Months Ended
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Sep. 30, 2019
Stockholders' Equity Note [Abstract] |
Warrants to Purchase Common or Preferred Stock | Warrants to Purchase Common or Preferred Stock In connection with the completion of the Company's IPO in September 2019: •The remaining outstanding Series F redeemable convertible preferred stock warrants automatically converted into warrants exercisable for an aggregate 104,722 shares of common stock. •Warrants to purchase common stock for 569,184 shares of the Company's common stock were exercised via cashless exercise resulting in the issuance of 512,363 shares of common stock. Unexercised warrants to purchase common stock for 9,054 shares were terminated prior to the completion of the IPO. •Warrants to purchase Series D and Series E redeemable convertible preferred stock for 119,771 shares of the Company's common stock were exercised via cashless exercise resulting in the issuance of 27,431 shares of common stock. Outstanding Warrants The following warrants to purchase common stock were outstanding as of September 30, 2019:
| Shares |  | Exercise Price |  | Issuance date |  | Expiration date
Common stock warrants | 282,402 |  | $ | 1.84 |  |  | January 19, 2016 |  | January 19, 2026
Common stock warrants | 74,018 |  | 1.84 |  | March 31, 2016 |  | March 31, 2026
Common stock warrants | 131 |  | 1.84 |  | April 1, 2016 |  | April 1, 2026
Common stock warrants (1) | 83,778 |  | 14.32 |  | September 8, 2017 |  | September 8, 2024
Common stock warrants (1) | 20,944 |  | 14.32 |  | December 7, 2018 |  | December 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. The outstanding warrants to purchase shares of common stock are equity classified at September 30, 2019.

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- Definition The entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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