| Cover | Mar. 10, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 10, 2022 |
| Entity File Number | 001-39687 |
| Entity Registrant Name | CompoSecure, Inc. |
| Entity Central Index Key | 0001823144 |
| Entity Tax Identification Number | 85-2749902 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 309 Pierce Street |
| Entity Address, City or Town | Somerset |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08873 |
| City Area Code | 908 |
| Local Phone Number | 518-0500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, $0.0001 par value |
| Trading Symbol | CMPO |
| Security Exchange Name | NASDAQ |
| Redeemable warrants, each whole warrant exercisable for one share of Class A Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one share of Class A Common Stock |
| Trading Symbol | CMPOW |
| Security Exchange Name | NASDAQ |
