Summary of Significant Accounting Policies - Schedule of warranty accruals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$ 602	$ 2,326	$ 602	$ 2,326	$ 627	$ 1,125	$ 2,403	$ 2,547
Accrual for warranties issued	0	0	0	35
Transfer of inventory to servicers	0	7	(498)	0
Accrual related to World Energy	(25)	0	(25)	0
Warranty fulfillment charges	0	(84)	0	(256)
Balance at the end of the period	$ 602	$ 2,326	$ 602	$ 2,326