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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | IPO | Erasca Foundation | Convertible Preferred Stock | Common Stock | Common Stock IPO | Common Stock Erasca Foundation | Additional Paid-in Capital | Additional Paid-in Capital IPO | Additional Paid-in Capital Erasca Foundation | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Convertible preferred stock, beginning balance, shares at Dec. 31, 2019 |  |  |  | 38,103,681 |  |  |  |  |  |  |  |
Convertible preferred stock, beginning balance, value at Dec. 31, 2019 |  |  |  | $ 63,403 |  |  |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2019 |  |  |  |  | 22,629,158 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ (13,604) |  |  |  | $ 3 |  |  | $ 124 |  |  | $ 11 | $ (13,742)
Issuance of Series B-1 and B-2 convertible preferred stock for cash, shares |  |  |  | 27,481,001 |  |  |  |  |  |  |  |
Issuance of Series B-1 and B-2 convertible preferred stock for cash |  |  |  | $ 128,002 |  |  |  |  |  |  |  |
Issuance of Series B-2 convertible preferred stock in connection with asset acquisition, Shares |  |  |  | 4,000,000 |  |  |  |  |  |  |  |
Issuance of Series B-2 convertible preferred stock in connection with asset acquisition |  |  |  | $ 30,000 |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  | 3,542,113 |  |  |  |  |  |  |
Exercise of stock options | 170 |  |  |  |  |  |  | 170 |  |  |  |
Vesting of early exercised stock options | 322 |  |  |  |  |  |  | 322 |  |  |  |
Repurchases of early exercised stock options and restricted stock, Shares |  |  |  |  | (981,598) |  |  |  |  |  |  |
Stock-based compensation expense | 797 |  |  |  |  |  |  | 797 |  |  |  |
Net loss | (101,660) |  |  |  |  |  |  |  |  |  |  | (101,660)
Unrealized loss on investments, net | $ (9) |  |  |  |  |  |  |  |  |  | (9) |
Convertible preferred stock, ending balance, shares at Dec. 31, 2020 |  |  |  | 69,584,682 |  |  |  |  |  |  |  |
Convertible preferred stock,ending balance, value at Dec. 31, 2020 |  |  |  | $ 221,405 |  |  |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2020 | 25,189,673 |  |  |  | 25,189,673 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ (113,984) |  |  |  | $ 3 |  |  | 1,413 |  |  | 2 | (115,402)
Issuance of Series B-1 and B-2 convertible preferred stock for cash, shares |  |  |  | 15,931,772 |  |  |  |  |  |  |  |
Issuance of Series B-1 and B-2 convertible preferred stock for cash |  |  |  | $ 119,393 |  |  |  |  |  |  |  |
Issuance of common stock in connection with asset acquisition, shares |  |  |  |  | 500,000 |  |  |  |  |  |  |
Issuance of common stock in connection with asset acquisition | 1,680 |  |  |  |  |  |  | 1,680 |  |  |  |
Issuance of common stock in connection with license agreement, shares |  |  |  |  | 944,945 |  |  |  |  |  |  |
Issuance of common stock in connection with license agreement | 5,488 |  |  |  |  |  |  | 5,488 |  |  |  |
Temporary Equity Stock Issued During Period Shares Conversion Of Convertible Securities |  |  |  | (85,516,454) |  |  |  |  |  |  |  |
Temporary Equity Stock Issued During Period Value Conversion Of Convertible Securities |  |  |  | $ (340,798) |  |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering, shares |  |  |  |  | 71,263,685 |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering | 340,798 |  |  |  | $ 7 |  |  | 340,791 |  |  |  |
Issuance of common stock, net of discounts and issuance costs, Shares |  |  |  |  |  | 21,562,500 | 1,093,557 |  |  |  |  |
Issuance of common stock, net of discounts and issuance costs |  | $ 316,999 | $ 17,497 |  |  | $ 2 |  |  | $ 316,997 | $ 17,497 |  |
Disgorgement of Stockholder's Short-swing Profits. | 553 |  |  |  |  |  |  | 553 |  |  |  |
Exercise of stock options, shares |  |  |  |  | 736,200 |  |  |  |  |  |  |
Exercise of stock options | 335 |  |  |  |  |  |  | 335 |  |  |  |
Vesting of early exercised stock options | 692 |  |  |  |  |  |  | 692 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan, Shares |  |  |  |  | 91,987 |  |  |  |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | 1,067 |  |  |  |  |  |  | 1,067 |  |  |  |
Stock-based compensation expense | 8,331 |  |  |  |  |  |  | 8,331 |  |  |  |
Net loss | (122,764) |  |  |  |  |  |  |  |  |  |  | (122,764)
Unrealized loss on investments, net | $ (164) |  |  |  |  |  |  |  |  |  | (164) |
Convertible preferred stock, ending balance, shares at Dec. 31, 2021 |  |  |  | 0 |  |  |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2021 | 121,382,547 |  |  |  | 121,382,547 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2021 | $ 456,528 |  |  |  | $ 12 |  |  | $ 694,844 |  |  | $ (162) | $ (238,166)

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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 + Details
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