Contract Liabilities (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024 USD ($) mill sub-stationTransformer	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) mill sub-stationTransformer	Jun. 30, 2023 USD ($)	May 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Long-Lived Assets Held-for-sale [Line Items]
Contract with customer	$ 300			$ 300			$ 1,550
Gain on non-refundable deposit	109		$ 0	$ 1,550	$ 0
SAG Mill, Ball Mill, Sub-Station Transformer
Long-Lived Assets Held-for-sale [Line Items]
Contract with customer						$ 300
Proceeds from patent sale	1,600
Gain on non-refundable deposit	$ (100)	$ (1,500)
SAG Mill
Long-Lived Assets Held-for-sale [Line Items]
Number of mills | mill	1			1
Ball Mill
Long-Lived Assets Held-for-sale [Line Items]
Number of mills | mill	1			1
Sub-Station Transformer
Long-Lived Assets Held-for-sale [Line Items]
Number of transformers | sub-stationTransformer	2			2