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Stockholders' Equity (Deficit) | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity Note [Abstract] |
Stockholders' Equity (Deficit) | 7. Stockholders’ Equity (Deficit) Redeemable Convertible Preferred Stock Prior to its conversion to common stock in December 2020, the Company’s redeemable convertible preferred stock was classified as mezzanine equity on the Company’s balance sheets as the shares are contingently redeemable upon a deemed liquidation such as a change in control and in that event, there is no guarantee that all stockholders would be entitled to receive the same form of consideration. No accretion to redemption value was recorded during the three months ended March 31, 2020 as a deemed liquidation event was not considered probable. In March 2020, the Company issued 14,701,054 shares of its Series B redeemable convertible preferred stock, including 4,673,388 shares issued upon conversion of then outstanding convertible notes and accrued interest, and 10,027,666 shares issued for cash at a purchase price of $2.16 per share, resulting in gross proceeds of $21.5 million. The Series B purchase agreement provided that the Company would issue, and the Series B holders would purchase, an additional 21,732,862 shares of the Company’s Series B redeemable convertible preferred stock across two tranches for aggregate proceeds of $46.9 million in the event that certain agreed upon milestones were achieved or the preferred majority approved their closing. As of March 31, 2020, these future Series B tranches did not meet the definition of freestanding instruments or the definition of derivatives, therefore, they were not accounted for separately or bifurcated. Common Stock The Company has reserved shares of common stock for the following potential future issuances:
|  | March 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Shares underlying outstanding equity awards |  |  | 6,308,582 |  |  |  | 6,316,569 |
Shares available for future equity award grants |  |  | 3,152,910 |  |  |  | 1,506,806 |
Shares underlying early exercised equity awards |  |  | 76,293 |  |  |  | 100,263 |
Shares underlying ESPP withholdings |  |  | 19,126 |  |  |  | 4,393 |
Total |  |  | 9,556,911 |  |  |  | 7,928,031 |

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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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