Commitments and Contingencies - Settlement Agreement (Details)	Dec. 30, 2021 USD ($)	Dec. 20, 2021 USD ($) item	Dec. 20, 2021 KRW (₩) item	Jan. 31, 2022 USD ($)	Dec. 23, 2021 USD ($)
Commitments And Contingencies [Line Items]
Amount of contractual Obligation				$ 2,200,000
POSCO Energy Settlement Agreement
Commitments And Contingencies [Line Items]
Contingent liability		$ 1,800,000
Outstanding accounts receivable		$ 11,200,000
Period within which an application should be filed		5 days	5 days
Warrant period against module defect from the date of shipment.		18 months	18 months
Warrant period against module defect from the date of installation		12 months	12 months
Period for reimbursement due to shortfall or defect		7 years	7 years
Percentage of maximum annual reimbursement obligation		7.50%	7.50%
Number of firm, non-cancelable orders | item		12	12
Number of weeks within which the orders to be placed | item		2	2
Price per module of the orders to be placed		$ 3,000,000.0
Number of modules delivered | item		6
Period of right of first refusal on operation and maintenance services		24 months	24 months
Number of balance of plant units | item		8	8
Purchase price per unit of balance of plant units		$ 2,116,500	₩ 2,550,000,000
Amount of contractual Obligation	$ 24,000,000				$ 24,000,000.0
Amount of contractual obligation to be paid on fiscal year					14,000,000.0
Payments for contractual obligation	$ 14,000,000
POSCO Energy Settlement Agreement | Settlement agreement orders on or before March 31, 2022
Commitments And Contingencies [Line Items]
Amount of contractual obligation to be paid three months					5,000,000.0
POSCO Energy Settlement Agreement | Settlement agreement orders on or before June 30, 2022
Commitments And Contingencies [Line Items]
Number of additional firm, non-cancelable orders to be placed | item		8	8
Amount of contractual obligation to be paid in next six months					$ 5,000,000.0
POSCO Energy Settlement Agreement | Settlement agreement orders on or before December 31, 2022
Commitments And Contingencies [Line Items]
Number of additional firm, non-cancelable orders to be placed | item		14	14
Price per module of the orders to be placed		$ 3,000,000.0