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Related Party Transactions - Other Purchases and Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Affiliated Entity          
Related Party Transaction [Line Items]          
Purchases from related parties $ 10 $ 0 $ 20    
Due to related parties 9   9   $ 8
Affiliated Entity | Applied Cryo Technologies          
Related Party Transaction [Line Items]          
Payment for equipment repairs and services       $ 109  
Related party sales     0    
Due from related parties 0   0   4
Due to related parties $ 0   $ 0   24
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 149   149   $ 22
Purchase of supplies and services $ 162 $ 17 $ 195 $ 31  
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 $ 73 $ 158 $ 40