Fair Value Measurements - Change in Level 2 Assets (Details) - USD ($) |
9 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Proceeds from the sale of investment securities | $ 11,637 | $ 0 |
| Gain on sale | $ 6,046 | 0 |
| Eurosite Power, Inc. | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale Equity, Number of Shares Sold | 93,187 | |
| Fair Value, Measurements, Recurring | Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value, beginning | $ 118,084 | 216,487 |
| Sale of 93,187 shares | (5,591) | |
| Unrealized gain (loss) | 18,749 | (98,403) |
| Fair value, ending | 131,242 | 118,084 |
| Fair Value, Measurements, Recurring | Level 2 | Eurosite Power, Inc. | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value, ending | $ 131,242 | $ 118,084 |
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- Definition Available-for-sale Equity, Number of Shares Sold No definition available.
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- Definition Increase (Decrease) in Available-for-sale Securities, Equity Securities No definition available.
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 Amount of unrealized gain (loss) on investment in marketable security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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