Commitments and Contingencies - Narrative (Detail) MMBTU in Thousands						1 Months Ended				3 Months Ended		6 Months Ended
	May 31, 2019	Jul. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2015 USD ($)	May 31, 2019 MMBTU	May 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Other Commitments [Line Items]
Property, plant, and equipment, net										$ 82,273,000		$ 82,273,000		$ 57,185,000
License payment, royalty payment										0
Operating and Maintenance Agreement
Other Commitments [Line Items]
Service agreement, periods							5 years
Operating and maintenance agreements, automatic extension periods							1 year
Property, plant, and equipment, net										400,000	$ 400,000	400,000	$ 400,000
Operating and Maintenance Agreement | Minimum
Other Commitments [Line Items]
Operating and maintenance agreements, fixed payments per year							$ 400,000
Take or Pay Steam Supply Agreement
Other Commitments [Line Items]
Property, plant, and equipment, net										100,000	100,000	$ 100,000	100,000
Service agreement, percentage of steam receivable thereafter	50.00%
Take or Pay Steam Supply Agreement | Maximum
Other Commitments [Line Items]
Service agreement, percentage of steam receivable during first year	25.00%
Service agreement, MMBtus per year generated | MMBTU | MMBTU						140
Joint Development Agreements
Other Commitments [Line Items]
Service agreement, periods												3 years
Property, plant, and equipment, net										0	0	$ 0	0
Patent License Agreement
Other Commitments [Line Items]
License agreement amount		$ 100,000	$ 500,000	$ 0
Royalty payment per year				0
Royalty payment, cumulative amount			500,000		$ 10,000,000
Upfront license fee royalty and a variable royalty, aggregate cap per facility			$ 10,000,000
License payment, royalty payment										$ 0	$ 0		$ 0
Patent License Agreement | Minimum
Other Commitments [Line Items]
Royalty payment per year								$ 15,000
Patent License Agreement | Maximum
Other Commitments [Line Items]
Royalty payment per year								$ 20,000
Royalty payment, cumulative amount				$ 1,000,000	$ 2,000,000
Nonexclusive Patents Llicense Agreement
Other Commitments [Line Items]
Royalty payment per year									$ 5,000
Percentage of net sales									0.40%