| Acquisition of American DG Energy Inc. - Additional Information (Details) - USD ($) | 12 Months Ended | |||
|---|---|---|---|---|
| May 18, 2017 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | |
| Business Acquisition [Line Items] | ||||
| Stock issuance costs netted against APIC | $ 377,246 | |||
| Goodwill | 8,975,065 | $ 2,406,156 | $ 5,281,867 | |
| Goodwill expected to be tax deductible | $ 0 | |||
| General and Administrative Expense | ||||
| Business Acquisition [Line Items] | ||||
| Acquisition related costs | $ 322,566 | |||
| American DG Energy | ||||
| Business Acquisition [Line Items] | ||||
| Ownership interest (percent) | 100.00% | |||
| Goodwill | $ 13,300,000 | 
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- Definition 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. No definition available. 
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. No definition available. 
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