v3.26.1
Cover Page - shares
 3 Months Ended
Mar. 31, 2026
May 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-37822  
Entity Registrant Name ARQ, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-5472457  
Entity Address, Address Line One 8051 E. Maplewood Ave.  
Entity Address, Address Line Two Ste. 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  
Title of 12(b) Security Common stock, par value $0.001 per share  
Trading Symbol ARQ  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   42,926,258
Entity Central Index Key 0001515156  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1