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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings The Company is from time to time subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business. Such matters are subject to many uncertainties and outcomes, the financial impacts of which are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its consolidated financial statements for costs related to claims, settlements, and judgments where management has assessed that a loss is probable and an amount can be reasonably estimated. There were no significant legal proceedings as of September 30, 2021. Restricted Cash As of September 30, 2021 and December 31, 2020, the Company had short-term restricted cash of $6.0 million and $5.0 million, respectively, as required under a minimum cash balance requirement of a Line of Credit covenant, and long-term restricted cash of $10.0 million and $5.0 million, respectively, as required under the Surety Agreement. Other Commitments and Contingencies The Company has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, NexGen Refined Coal, LLC ("NexGen") and two entities affiliated with NexGen have provided an affiliate of the Goldman Sachs Group, Inc. with limited guaranties (the "Tinuum Group Party Guaranties") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants. The Company also is a party to a contribution agreement with NexGen under which any party called upon to pay on a Tinuum Group Party Guaranty is entitled to receive contributions from the other party equal to 50% of the amount paid. The Company has not recorded a liability or expense provision related to this contingent obligation as it believes that it is not probable that a loss will occur with respect to the Tinuum Group Party Guaranties. Retention Agreements The Company entered into agreements with its executive officers and certain other key employees of the organization ("Retention Agreements"). The Retention Agreements are for the benefit of retaining those officers and key employees in order to maintain the Company’s current business operations while it pursues and executes on its strategic initiatives. The Retention Agreements with the executive officers were approved by the Board of Directors on May 5, 2021. The Company is recognizing expense over the expected service period, which is based on certain conditions outlined in the Retention Agreements. As of September 30, 2021, the Company had accrued $0.8 million, which is included in the Accrued payroll and related liabilities line item on the Condensed Consolidated Balance Sheet.