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Related Party Transactions - Other Purchases and Sales (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Affiliated Entity          
Related Party Transaction [Line Items]          
Purchases from related parties $ 2,000 $ 64,000 $ 22,000 $ 64,000  
Due to related parties $ 0   $ 0   $ 8,000
Affiliated Entity | Chart E&C          
Related Party Transaction [Line Items]          
Percentage of common stock owned 8.70%   8.70%    
Affiliated Entity | Applied Cryo Technologies          
Related Party Transaction [Line Items]          
Payment for equipment repairs and services       255,000  
Related party sales $ 0 4,000 $ 0 4,000  
Due from related parties 0   0   4,000
Due to related parties $ 13,000   $ 13,000   24,000
Affiliated Entity | TMG          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 25.00%   25.00%    
Due from related parties $ 0   $ 0   0
Due to related parties 7,000   7,000   $ 22,000
Purchase of supplies and services $ 18,000 $ 13,000 $ 213,000 $ 44,000  
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 $ 109,000 $ 413,000 $ 36,000