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Stockholders' Equity
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Reverse Stock Split
On September 6, 2019, the Company effected a one-for-183.635 reverse stock split of its common stock (the Reverse Stock Split). The par value and the authorized shares of the common stock were not adjusted as a result of the Reverse Stock Split. All issued and outstanding common stock and the conversion ratio of the redeemable convertible preferred stock have been retroactively adjusted to reflect this Reverse Stock Split for all periods presented in the accompanying financial statements and notes to the financial statements.
Common Stock
On September 23, 2019, the Company closed its IPO of 4,140,000 shares of its common stock at a price to the public of $14.00 per share, including the exercise in full by the underwriters of their option to purchase 540,000 additional shares of the Company's common stock. Including the exercise of the option to purchase additional shares, the aggregate net proceeds to the Company from the offering was approximately $50.4 million, net of underwriting discounts, commissions and other offering expenses, for aggregate expenses of approximately $7.5 million. In addition, an aggregate of 7,816,643 shares of common stock, excluding warrant conversions, were issued to the holders of the Company's Series A-3, Series B-3, Series C, Series D, Series E, Series F and Series H redeemable convertible preferred stockholders upon the automatic conversion of all shares of redeemable convertible preferred stock to common stock.
Outstanding Warrants
The following equity classified warrants to purchase common stock were outstanding as of December 31, 2020:
SharesExercise PriceIssuance dateExpiration date
Common stock warrants252,798$1.84 January 19, 2016January 19, 2026
Common stock warrants69,1761.84 March 31, 2016March 31, 2026
Common stock warrants1311.84 April 1, 2016April 1, 2026
Common stock warrants83,77814.32 September 7, 2017September 7, 2024
Common stock warrants20,94414.32 December 7, 2018December 7, 2025
426,827
During the year ended December 31, 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.