Investments in Other Entities and Noncontrolling Interest in a Subsidiary - NG Advantage (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Oct. 14, 2014
Schedule of Equity Method Investments [Line Items]
Loss from noncontrolling interest	$ 115	$ 224	$ 627	$ 784
Investments carried at cost	8,000		8,000
NG Advantage
Schedule of Equity Method Investments [Line Items]
Loss from noncontrolling interest	100	$ 200	600	$ 800
Noncontrolling interest, fair value	$ 7,700		$ 7,700		$ 8,300
NG Advantage | Common unit purchase agreement
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired						53.30%
Ownership interest after transaction (as a percent)			93.30%