Summary of Operations and Significant Accounting Policies - Additional Information (Details) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment institution shares	Dec. 31, 2022 USD ($) shares	Feb. 28, 2023
Accounting Policies [Line Items]
Number of financial institutions | institution	2
Time deposits, $250,000 or more	$ 250
Allowance	0	$ 0
Amortization expense	800	$ 500
Estimated future amortization, year one	$ 400
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]
Research and development	$ 3,300	$ 2,100
Total shares excluded from diluted shares outstanding (in shares) | shares	1.7	0.6
Number of reportable segments | segment	1
Arq Limited
Accounting Policies [Line Items]
Subsidiary, ownership percentage, parent			100.00%
Mine Reserve
Accounting Policies [Line Items]
Property and equipment estimated useful lives	14 years
Minimum
Accounting Policies [Line Items]
Property and equipment estimated useful lives	1 year
Contingent right to receive common stock per PSU	0
Maximum
Accounting Policies [Line Items]
Property and equipment estimated useful lives	31 years
Contingent right to receive common stock per PSU	2
Tinuum Group
Accounting Policies [Line Items]
Ownership interest	42.50%
Tinuum Services
Accounting Policies [Line Items]
Ownership interest	50.00%