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Stockholder's equity (deficit) | 3 Months Ended
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Mar. 31, 2021
Stockholder’s equity (deficit) |
Stockholder’s equity (deficit) | 6. Stockholder’s equity (deficit) Common stock As of March 31, 2021 and December 31, 2020, the Company’s certificate of incorporation, as amended and restated, authorized the Company to issue 150,000,000 shares of $0.0001 par value common stock. Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. The holders of common stock, voting exclusively and as a separate class, have the exclusive right to vote for the election of directors of the Company. Common stockholders are entitled to receive dividends, as may be declared by the board of directors. Through March 31, 2021, no cash dividends had been declared or paid. On June 24, 2019, the Company completed its IPO at which time the Company issued 6,612,500 shares of common stock, including the exercise in full by the underwriters of their option to purchase up to 862,500 additional shares of common stock, at a public offering price of $16.00 per share. The Company received $98,394, net of underwriting discounts and commissions, but before deducting offering costs paid by the Company, which were $2,942. Upon the closing of the IPO, all outstanding shares of convertible preferred stock converted into 21,056,136 shares of common stock. On July 10, 2020, the Company completed a follow-on public offering at which time the Company issued 6,012,390 shares of common stock, including the exercise in full by the underwriters of their option to purchase up to 784,224 additional shares of common stock, at a public offering price of $36.00 per share. The Company received $203,460 net of underwriting discounts and commissions, but before deducting offering costs paid by the Company, which were $906. As of March 31, 2021 and December 31, 2020, there were 34,770,319 and 34,741,649 shares of common stock issued and outstanding, respectively. The following shares of common stock were reserved for issuance as follows:
|  | March 31, 2021 |  | December 31, 2020
Options outstanding under the 2018 Stock Option and Grant Plan |  | 2,119,349 |  | 2,148,019
Options outstanding under the 2019 Stock Option and Incentive Plan |  | 1,758,356 |  | 1,585,293
Options available for future grant |  | 3,344,146 |  | 2,127,544
2019 Employee Stock Purchase Plan |  | 891,379 |  | 543,963
Total |  | 8,113,230 |  | 6,404,819
Undesignated preferred stock The Company’s fourth amended and restated certificate of incorporation authorizes the Company to issue up to 10,000,000 shares of undesignated preferred stock, par value $0.0001 per share. There were no undesignated preferred shares issued or outstanding as of March 31, 2021. Restricted common stock In March 2017, the Company issued an aggregate of 226,400 shares of restricted common stock under restricted stock agreements with the founders. Pursuant to the terms of the agreements, the restricted common stock was initially subject to a vesting schedule over a four-year period commencing in January 2017 and culminating in January 2021. In March 2018, the Company amended the restricted stock agreements such that the restricted common stock became subject to a vesting schedule over a two-year period commencing in May 2018 and culminating in June 2020. As of March 31, 2021, all restricted stock issued to the founders is fully vested. In April, June and July 2019, the Company amended certain option grant agreements granted under the Company’s 2018 Stock Option and Grant Plan to allow the holders the right to early exercise unvested options, subject to a repurchase right held by the Company equal to the lesser of the original exercise price per share or the fair value of the shares on the repurchase date. The unvested shares issued as a result of the early exercise are deemed restricted stock pursuant to a restricted stock agreement and a vesting schedule identical to the vesting schedule of the original grant agreement. The proceeds related to unvested restricted common stock are recorded as liabilities until the stock vests, at which point they are reclassified to additional paid-in capital. Common shares issued for the early exercise of options are included in issued and outstanding shares. The following table summarizes restricted stock activity since December 31, 2020:
|  |  |  | Grant-Date Fair
|  | Number of Shares |  | Value
Unvested restricted common stock as of December 31, 2020 |  | 33,614 |  |  | 0.62
Shares vesting |  | (14,889) |  |  | 0.62
Unvested restricted common stock as of March 31, 2021 |  | 18,725 |  | $ | 0.62
As of March 31, 2021, there were 18,725 shares of unvested restricted common stock from the early exercise of stock options.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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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