Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets Measured on Recurring Basis

The following table presents the asset reported in the consolidated balance sheet measured at its fair value on a recurring basis as of December 31, 2021 and 2020 by level within the fair value hierarchy.

			Quoted prices in active markets for identical assets		Significant other observable inputs		Significant unobservable inputs
	Total		Level 1		Level 2		Level 3		Total losses
December 31, 2021
Recurring fair value measurements
Available-for-sale equity securities
EuroSite Power Inc.	$	74,995	$	—	$	74,995	$	—	$	(37,497)
Total recurring fair value measurements	$	74,995	$	—	$	74,995	$	—	$	(37,497)

December 31, 2020
Recurring fair value measurements
Available-for-sale equity securities
EuroSite Power Inc.	$	118,084	$	—	$	118,084	$	—	$	(98,403)
Total recurring fair value measurements	$	118,084	$	—	$	118,084	$	—	$	(98,403)

The following table summarizes changes in Level 2 assets which are comprised of marketable equity securities for the years ended December 31, 2021 and 2020:

Fair value at December 31, 2019	$	216,487
Unrealized loss	(98,403)
Fair value at December 31, 2020	$	118,084
Fair value at December 31, 2020	$	118,084
Sale of 93,187 shares	(5,592)
Unrealized loss	(37,497)
Fair value at December 31, 2021	$	74,995