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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Stockholders' Equity | Stockholders' Equity Outstanding Warrants The following equity classified warrants to purchase common stock were outstanding as of March 31, 2020:
| Shares |  | Exercise Price |  | Issuance date |  | Expiration date
Common stock warrants | 259,975 |  | $ | 1.84 |  |  | January 19, 2016 |  | January 19, 2026
Common stock warrants | 71,753 |  | 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
| 436,581 |  |  |  |  |  |
(1) Prior to the conversion upon IPO, the remaining warrants were for the purchase of Series F redeemable convertible preferred stock. During the first quarter of 2020, warrants to purchase common stock for 24,692 shares of the Company's common stock were exercised via cashless exercise resulting in the issuance of 22,366 shares of common stock

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + 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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