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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) shares | May 31, 2024 USD ($) $ / shares shares | Apr. 30, 2024 USD ($) shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 shares | Sep. 30, 2024 $ / shares | Dec. 31, 2023 shares | May 05, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to Arq Acquisition, net of offering costs | $ |  |  |  |  | $ 26,659 |  |  |  |  |  |
Number of shares agreed to purchase (in shares) |  | 5,485,500 |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 46,652,061 |  |  | 46,652,061 |  | 46,652,061 |  |  | 37,791,084 |
Deducting offering expenses | $ |  | $ 26,700 |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  |  |  | 0 | 0 | 0 | 0 |  |  |
Price per share (in dollars per share) | (per share) | $ 4.00 |  |  |  |  |  |  |  | $ 5.25 |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to purchase (in shares) |  | 715,500 |  |  |  |  |  |  |  |  |
Original Amount |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to purchase (in shares) |  | 4,770,000 |  |  |  |  |  |  |  |  |
Additional Option |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to purchase (in shares) |  | 715,500 |  |  |  |  |  |  |  |  |
Purchase period |  | 30 days |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requirement to own shares outstanding (as percent) |  |  |  |  |  |  |  |  |  |  | 4.99%
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to Arq Acquisition, net of offering costs | $ |  |  |  |  | $ 5 |  |  |  |  |  |
Issuance of common stock pursuant to Arq Acquisition, net of offering costs (in shares) |  |  |  |  | 5,485,500 |  |  |  |  |  |
Deducting offering expenses | $ | $ 15,400 |  |  |  |  |  |  |  |  |  |
Remaining authorized amount | $ |  | $ 7,000 |  |  | $ 7,000 |  | $ 7,000 |  |  |  |
Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to purchase (in shares) |  |  | 2,142,858 |  |  |  |  |  |  |  |
Share price (amount per shares) | $ / shares |  |  | $ 7.00 |  |  |  |  |  |  |  |
Net proceeds from common stock issued | $ |  |  | $ 15,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to Arq Acquisition, net of offering costs | $ |  |  |  | $ 800 |  |  |  |  |  |  |
Issuance of common stock pursuant to Arq Acquisition, net of offering costs (in shares) |  |  |  | 422,221 |  |  |  |  |  |  |

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