Notes Payable - Narrative (Detail) $ in Thousands			1 Months Ended		9 Months Ended	12 Months Ended
	Aug. 01, 2022 USD ($)	Nov. 30, 2016 USD ($)	May 31, 2019 USD ($) installment	Nov. 30, 2016 USD ($)	Sep. 30, 2024 USD ($) agreement	Dec. 31, 2023 USD ($)	Dec. 31, 2019 USD ($)	Feb. 29, 2024 USD ($)
Debt Disclosure [Line Items]
Number of offtake supply agreements (in agreements) | agreement					8
Number of offtake supply agreements with same customer (in agreements) | agreement					2
Debt instrument accrued interest					$ 100	$ 600
Notes payable, long-term					1,730	3,459
Notes payable, short-term					3,772	1,730
Principal outstanding amount						5,100
Promissory Note
Debt Disclosure [Line Items]
Prepayment from stockholder				$ 5,000
Debt instrument accrued interest			$ 200
Number of installments (in installments) | installment			3
Long-term debt, maturity, year two	$ 2,700
Long-term debt, maturity, year three	1,900
Long-term debt, maturity, year four	$ 1,800
Accrued interest rate	3.50%
Other long-term debt					3,500	5,200
Accrued interest					100	800
Notes payable, long-term					1,700	3,500
Notes payable, short-term					$ 1,700	$ 1,700
Initial term of offtake supply agreement					10 years
Promissory Note | Legacy stockholder note
Debt Disclosure [Line Items]
Principal amount	$ 5,200
Promissory Note One
Debt Disclosure [Line Items]
Debt instrument accrued interest							$ 100
Other long-term debt		$ 5,000		$ 5,000
Aggregate principal amount							$ 5,100
Repayment period under prepayment agreement				5 years
Amount of repayment under prepayment agreement		$ 7,500		$ 7,500
Repayment percentage of prepayment agreement amount				150.00%
Variable interest rate		0.25%
Loan facility interest rate					5.56%
Loan facility term					5 years
​Repayments​ of​ installments, one								$ 2,200
​Repayments​ of​ installments, two								1,600
​Repayments​ of​ installments, three								$ 2,100
Remaining outstanding principal					$ 2,000