Stock-Based Compensation - Narrative (Details)	9 Months Ended
Stock-Based Compensation - Narrative (Details)	Sep. 30, 2025
Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	3 years
Performance Share Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	3 years
Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	3 years
Options exercisable, weighted average remaining contractual term (in years)	7 years 9 months 14 days
Expected dividend rate	0.00%
Stock Option \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options exercisable, weighted average remaining contractual term (in years)	10 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Arq, Inc. 10-Q