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Related Party Transactions - Other Purchases and Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Due from related parties	$ 0		$ 0		$ 42,000
Secured term note payable - related party	$ 0		$ 0		1,077,000
Applied Cryo Technologies
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	51.00%	51.00%	51.00%	51.00%
Payment for equipment repairs and services	$ 32,000	$ 36,000	$ 530,000	$ 109,000
Affiliated Entity
Related Party Transaction [Line Items]
Purchases from related parties	59,000	2,000	137,000	22,000
Secured term note payable - related party	$ 58,000		$ 58,000		14,000
Affiliated Entity | Crenshaw Family Holdings | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of beneficial ownership			25.00%
Affiliated Entity | Chart E&C
Related Party Transaction [Line Items]
Percentage of common stock owned	8.30%		8.30%
Affiliated Entity | Applied Cryo Technologies
Related Party Transaction [Line Items]
Related party sales	$ 30,000	0	$ 30,000	0
Due from related parties	30,000		30,000		2,000
Due to related parties	$ 15,000		$ 15,000		121,000
Affiliated Entity | TMG
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	25.00%		25.00%
Related party sales	$ 13,000	0	$ 13,000	0
Due from related parties	11,000		11,000		0
Due to related parties	548,000		548,000		$ 582,000
Purchase of supplies and services	$ 127,000	$ 18,000	$ 848,000	$ 213,000

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