Document and Entity Information |
Apr. 20, 2026 |
|---|---|
| Cover [Abstract] | |
| Entity Registrant Name | ANAPTYSBIO, INC |
| Amendment Flag | true |
| Entity Central Index Key | 0001370053 |
| Document Type | 8-K/A |
| Document Period End Date | Apr. 20, 2026 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37985 |
| Entity Tax Identification Number | 20-3828755 |
| Entity Address, Address Line One | 10770 Wateridge Circle |
| Entity Address, Address Line Two | Suite 210 |
| Entity Address, City or Town | San Diego |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92121 |
| City Area Code | (858) |
| Local Phone Number | 362-6295 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, par value $0.001 per share |
| Trading Symbol | ANAB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | In this Amendment No. 1 the Company amends the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission on April 20, 2026 (the “Original Form 8-K”) that reported the completion of the Spin-Off. The Original Form 8-K did not include the unaudited pro forma financial information of the Company reflecting the performance of the Company’s businesses after giving effect to the Spin-Off. This Amendment No. 1 to the Original Form 8-K is being filed to include such pro forma financial information as required under Item 9.01(b) of Form 8-K. |