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Related Party Transactions - Other Purchases and Sales (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Due from related parties	$ 2,000		$ 42,000
Applied Cryo Technologies
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	51.00%	51.00%
Payment for equipment repairs and services	$ 366,000	$ 33,000
Affiliated Entity
Related Party Transaction [Line Items]
Purchases from related parties	43,000	10,000
Due to related parties	$ 19,000		14,000
Affiliated Entity | TMG | 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	8.70%
Affiliated Entity | Applied Cryo Technologies
Related Party Transaction [Line Items]
Related party sales	$ 0	0
Due from related parties	2,000		2,000
Due to related parties	$ 353,000		121,000
Affiliated Entity | TMG
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	25.00%
Due from related parties	$ 0		0
Due to related parties	902,000		$ 582,000
Purchase of supplies and services	$ 530,000	$ 33,000

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