| Cover Page | Mar. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 12, 2024 |
| Entity Registrant Name | ARQ, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37822 |
| Entity Tax Identification Number | 27-5472457 |
| Entity Address, Address Line One | 8051 E. Maplewood Avenue |
| Entity Address, Address Line Two | Suite 210 |
| Entity Address, City or Town | Greenwood Village |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80111 |
| City Area Code | 720 |
| Local Phone Number | 598-3500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.001 per share |
| Trading Symbol | ARQ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001515156 |
| Amendment Flag | false |
