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Consolidated Statements of Convertible Preferred Stock and Stockholders’ Deficit - USD ($) | Common Stock IPO | Common Stock | Additional Paid-in capital IPO | Additional Paid-in capital | Accumulated other comprehensive loss | Accumulated deficit | Series A convertible preferred stock | Series B convertible preferred stock | Series C convertible preferred stock | IPO | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Temporary equity, beginning balance at Dec. 31, 2017 |  |  |  |  |  |  | $ 6,483,044 | $ 49,742,942 |  |  |
Temporary Equity, Beginning Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | 612,446 | 7,235,969 |  |  |
Increase (Decrease) in Temporary Equity |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock, net of issuance costs |  |  |  |  |  |  |  |  | $ 56,364,645 |  |
Issuance of convertible preferred stock (in shares) |  |  |  |  |  |  |  |  | 4,712,698 |  |
Temporary equity, ending balance at Dec. 31, 2018 |  |  |  |  |  |  | $ 6,483,044 | $ 49,742,942 | $ 56,364,645 |  |
Temporary Equity, Ending Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 612,446 | 7,235,969 | 4,712,698 |  |
Equity, beginning balance at Dec. 31, 2017 |  | $ 126,838 |  | $ 19,335,560 | $ (8,287,406) | $ (46,940,187) |  |  |  |  | $ (35,765,195)
Equity, beginning balance (in shares) at Dec. 31, 2017 |  | 1,153,061 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | $ 253 |  | 1,844 |  |  |  |  |  |  | 2,097
Exercise of stock options (in shares) |  | 2,305 |  |  |  |  |  |  |  |  |
Stock‑based compensation |  |  |  | 329,184 |  |  |  |  |  |  | 329,184
Foreign currency translation |  |  |  |  | (473,919) |  |  |  |  |  | (473,919)
Net loss |  |  |  |  |  | (15,528,269) |  |  |  |  | (15,528,269)
Equity, ending balance at Dec. 31, 2018 |  | $ 127,091 |  | 19,666,588 | (8,761,325) | (62,468,456) |  |  |  |  | (51,436,102)
Equity, ending balance (in shares) at Dec. 31, 2018 |  | 1,155,366 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock, net of issuance costs |  |  |  |  |  |  |  |  | $ 5,598,362 |  |
Issuance of convertible preferred stock (in shares) |  |  |  |  |  |  |  |  | 467,179 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | $ 3,179 |  | 67,818 |  |  |  |  |  |  | 70,997
Exercise of stock options (in shares) |  | 322,267 |  |  |  |  |  |  |  |  |
Issuance of common stock | $ 6,517 |  | $ 86,899,563 | 100 |  |  |  |  |  | $ 86,906,080 | 100
Issuance of common stock (in shares) | 6,516,667 | 160 |  |  |  |  |  |  |  |  |
Stock‑based compensation |  |  |  | 1,345,722 |  |  |  |  |  |  | 1,345,722
Foreign currency translation |  |  |  |  | (2,772,453) |  |  |  |  |  | (2,772,453)
Exchange of preferred and common stock of Aprea Therapeutics AB into stock of Aprea Therapeutics, Inc. |  | $ (128,792) |  | 128,792 |  |  |  |  |  |  |
Conversion of preferred stock into common stock |  | $ (13,028) |  | (118,175,965) |  |  | $ 6,483,044 | $ 49,742,942 | $ 61,963,007 |  | (118,188,993)
Conversion of preferred stock into common stock (in shares) |  | 13,028,292 |  |  |  |  | (612,446) | (7,235,969) | (5,179,877) |  |
Net loss |  |  |  |  |  | (28,059,807) |  |  |  |  | (28,059,807)
Equity, ending balance at Dec. 31, 2019 |  | $ 21,023 |  | 226,284,548 | (11,533,778) | (90,528,263) |  |  |  |  | 124,243,530
Equity, ending balance (in shares) at Dec. 31, 2019 |  | 21,022,752 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | $ 164 |  | 150,785 |  |  |  |  |  |  | 150,949
Exercise of stock options (in shares) |  | 164,075 |  |  |  |  |  |  |  |  |
Stock‑based compensation |  |  |  | 4,983,023 |  |  |  |  |  |  | 4,983,023
Foreign currency translation |  |  |  |  | 1,496,517 |  |  |  |  |  | 1,496,517
Net loss |  |  |  |  |  | (53,478,812) |  |  |  |  | (53,478,812)
Equity, ending balance at Dec. 31, 2020 |  | $ 21,187 |  | $ 231,418,356 | $ (10,037,261) | $ (144,007,075) |  |  |  |  | $ 77,395,207
Equity, ending balance (in shares) at Dec. 31, 2020 |  | 21,186,827 |  |  |  |  |  |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Carrying amount, attributable to parent and noncontrolling interests, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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