Document and Entity Information
| Document and Entity Information | Sep. 11, 2023 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001855485 |
| Document Type | 8-K |
| Document Period End Date | Sep. 11, 2023 |
| Entity Registrant Name | First Light Acquisition Group, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40789 |
| Entity Tax Identification Number | 86-2967193 |
| Entity Address, Address Line One | 11110 Sunset Hills Road #2278 |
| Entity Address, City or Town | Reston |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 20190 |
| City Area Code | (202) |
| Local Phone Number | 503-9255 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Units Each Consisting Of One Share Of Class A Common Stock And One Half Of One Redeemable Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant |
| Trading Symbol | FLAGU |
| Security Exchange Name | NYSEAMER |
| Class A Common Stock Par Value 0.0001 Per Share 2 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A common stock, par value $0.0001 per share |
| Trading Symbol | FLAG |
| Security Exchange Name | NYSEAMER |
| Redeemable Warrants Each Whole Warrant Exercisable For One Share Of Class A Common Stock At An Exercise Price Of 11.50 Per Share 1 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share |
| Trading Symbol | FLAGW |
| Security Exchange Name | NYSEAMER |