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Debt Obligations - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2024 shares | Feb. 01, 2023 USD ($) $ / shares shares | Jan. 27, 2021 USD ($) debtInstrument | Mar. 31, 2024 shares | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 02, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  |  |  |  | $ 623,000 | $ 815,000 |
Debt instrument, post-transaction from exercise of warrant |  | 1.00% |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Exercise of warrant, net (in shares) | shares | 324,955 |  |  | 324,955 |  |  |
CF Global Credit, LP |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issuance of warrant (in shares) | shares |  | 325,457 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |
Term |  | 7 years |  |  |  |  |
Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 10,000,000.0 |  |  |  |  |
Unamortized discount |  | 200,000 |  |  |  |  |
Net cash proceeds |  | 8,500,000 |  |  |  |  |
Debt issuance costs |  | $ 1,300,000 |  |  |  |  |
Promissory Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of instruments (in instruments) | debtInstrument |  |  | 2 |  |  |  |
Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |
Debt instrument, covenant loan to value ratio |  | 0.40 |  |  |  |  |
Secured Debt | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount |  | $ 300,000 |  |  |  |  |
Face amount |  | 10,000,000.0 |  |  |  |  |
Estimated fair value |  | $ 9,700,000 |  |  |  |  |
Periodic payment, principal |  |  | $ 100,000 |  |  |  |
Debt instrument, fee amount |  |  |  |  |  |  | $ 50,000
Debt instrument, collateral amount |  |  |  |  |  |  | $ 700,000
Indebtedness to net worth ratio |  |  |  |  | 4 |  |
Debt instrument, annual increase |  |  |  |  | 20.00% |  |
Equity percentage |  |  |  |  | 1.25 |  |
Secured Debt | Arq Limited | Promissory Note A |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  | 8,000,000.0 |  |  |  |
Secured Debt | Arq Limited | Promissory Note B |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  | $ 2,000,000.0 |  |  |  |
Secured Debt | Between 1 And 36 Moths |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, prepayment premium |  | 2.00% |  |  |  |  |
Secured Debt | Between 37 Months And Maturity Date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, prepayment premium |  | 1.00% |  |  |  |  |
Secured Debt | Adjusted Term SOFR for an Interest Period of One Month in Effect on the Third U.S. Government Securities Business Day |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, prepayment premium |  | 2.00% |  |  |  |  |
Secured Debt | Fiscal Year 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, minimum annual Revenue requirement |  | $ 85,000,000 |  |  |  |  |
Debt covenant, minimum consolidated EBITDA requirement |  | 3,000,000 |  |  |  |  |
Secured Debt | Fiscal Year 2025 and Thereafter |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, minimum annual Revenue requirement |  | 100,000,000 |  |  |  |  |
Debt covenant, minimum consolidated EBITDA requirement |  | 16,000,000 |  |  |  |  |
Secured Debt | Through January 2026 | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 6.00% |  |  |  |
Secured Debt | Penalty Year 2024 | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment penalty, percentage |  |  |  |  | 3.00% |  |
Secured Debt | Penalty Year 2025 | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment penalty, percentage |  |  |  |  | 2.00% |  |
Secured Debt | Penalty Year 2026 | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment penalty, percentage |  |  |  |  | 1.00% |  |
Secured Debt | Beginning March 31, 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt covenant, minimum cash balance requirement |  | $ 5,000,000 |  |  |  |  |
Secured Debt | SOFR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, floor rate percentage |  | 1.00% |  |  |  |  |
Debt instrument, cap rate percentage |  | 2.00% |  |  |  |  |
Debt instrument, percent of paid in cash |  | 9.00% |  |  |  |  |
Debt instrument, percent of paid in kind |  | 5.00% |  |  |  |  |
Secured Debt | SOFR | Adjusted Term SOFR for an Interest Period of One Month in Effect on the Third U.S. Government Securities Business Day |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  | 14.00% |  |  |  |  |
Secured Debt | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, percent of paid in cash |  | 8.00% |  |  |  |  |
Secured Debt | Prime Rate | After January 2026 | Arq Limited |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 2.75% |  |  |  |

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