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Common Stock | 12 Months Ended
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Dec. 31, 2020
Stockholders Equity Note [Abstract] |
Common Stock | 9. 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. Common stockholders are entitled to receive dividends, as may be declared by the Company’s board of directors, however, holders of convertible preferred stock were entitled to any dividend received by the common stockholders if each preferred share had been converted into common stock. As of December 31, 2020 and 2019, no dividends had been declared. The Company issued restricted shares of common stock to its founders and non-employees. In addition, the Company issued restricted shares of common stock upon the early exercise of stock options under the Company’s 2016 Stock Option and Grant Plan (the “2016 Stock Plan”). The restrictions on the common shares generally lapse over four years. The Company included the proceeds from the sale of the restricted shares of common stock as a restricted stock liability on the accompanying consolidated balance sheets. Amounts are reclassified to additional paid-in capital as the restrictions lapse. The Company has the right to repurchase any unvested shares of restricted common stock at the original cost in the event of termination. The following table summarizes the restricted stock activity for the year ended December 31, 2020:
|  | Shares |  |  | Weighted- Average Purchase Price |
Unvested at December 31, 2019 |  |  | 679,158 |  |  | $ | 0.21 |
Vested |  |  | (579,825 | ) |  |  | 0.26 |
Cancelled |  |  | (14,844 | ) |  |  | 0.03 |
Unvested at December 31, 2020 |  |  | 84,489 |  |  |  | 0.04 |
The fair value of shares that vested during the year ended December 31, 2020 was $9,619. The Company has reserved the following shares of common stock:
|  | December 31, |
|  | 2020 |  |  | 2019 |
Conversion of Series A preferred stock |  |  | — |  |  |  | 16,002,820 |
Conversion of Series B preferred stock |  |  | — |  |  |  | 8,783,102 |
Conversion of Series C preferred stock |  |  | — |  |  |  | 35,097,955 |
Shares reserved under the compensation plan |  |  | 8,026,772 |  |  |  | 8,407,169 |
Total shares of common stock reserved for issuance |  |  | 8,026,772 |  |  |  | 68,291,046 |
Employee Stock Purchase Plan On July 8, 2020, the Company’s stockholders approved the 2020 Employee Stock Purchase Plan (the “ESPP”). The ESPP became effective on the date immediately prior to the effectiveness of Company’s registration statement on Form S-1 for its IPO. As of December 31, 2020, the ESPP provides for the issuance of up to 1,092,532 of share-based awards. As of December 31, 2020, no shares have been issued under the ESPP.

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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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