Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Goodwill [Line Items]
Beginning balance	$ 21,261,000
Goodwill acquired	0
Impairment of goodwill	0	$ (6,370,000)	$ (6,400,000)
Goodwill	21,261,000		27,631,000
Accumulated impairment losses	0		(6,370,000)
Ending balance	21,261,000		21,261,000
Thermal Processing Solutions
Goodwill [Line Items]
Beginning balance	5,905,000
Goodwill acquired	0
Impairment of goodwill	0	0
Goodwill	5,905,000		5,905,000
Accumulated impairment losses	0		0
Ending balance	5,905,000		5,905,000
Semiconductor Fabrication Solutions
Goodwill [Line Items]
Beginning balance	15,356,000
Goodwill acquired	0
Impairment of goodwill	0	$ (6,400,000)
Goodwill	15,356,000		21,726,000
Accumulated impairment losses	0		(6,370,000)
Ending balance	$ 15,356,000		$ 15,356,000