XML 6 R1.htm IDEA: XBRL DOCUMENT v3.23.3
Document and Entity Information
Oct. 05, 2023
Cover [Abstract]  
Document Type 8-K/A
Amendment Flag true
Document Period End Date Oct. 05, 2023
Entity Registrant Name SPERO THERAPEUTICS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-38266
Entity Tax Identification Number 46-4590683
Entity Address Address Line 1 675 Massachusetts Avenue, 14th Floor
Entity Address City Or Town Cambridge
Entity Address State Or Province MA
Entity Address Postal Zip Code 02140
City Area Code 857
Local Phone Number 242-1600
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.001 par value
Trading Symbol SPRO
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Amendment Description Spero Therapeutics, Inc. (the “Company”) is filing this Amendment No. 1 to Current Report on Form 8-K/A (this “Amendment”) to amend the Current Report on Form 8-K, originally filed by the Company with the U.S. Securities and Exchange Commission (the “SEC”) on October 10, 2023 (the “Original Report”). The Original Report was filed, among other things, to disclose (i) the voting results of the Company’s Annual Meeting of Stockholders held on October 5, 2023 (the “Annual Meeting”) and (ii) the filing on October 6, 2023 of a certificate of amendment (the “Charter Amendment”) to the Company’s Amended and Restated Certificate of Incorporation, as amended (the “Charter”), with the Secretary of State of the State of Delaware (the “Delaware Secretary”) to reflect new Delaware law provisions regarding officer exculpation and to add a federal forum selection clause.This Amendment amends the Original Report solely to correct the disclosure regarding the previously reported voting results with respect to the Charter Amendment Proposals (as defined below) and to disclose that the Company has filed a Certificate of Correction (the “Certificate of Correction”) with the Delaware Secretary to undo the Charter Amendment. 
Current Fiscal Year End Date --12-31
Entity Central Index Key 0001701108