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Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]          
Weighted-Average Amortization Period 16 years 8 months 12 days   16 years 7 months 6 days    
Finite lived intangible assets: gross carrying amount $ 14,050     $ 14,452  
Accumulated amortization (3,953)     (3,813)  
Finite lived intangible assets: net 10,097     10,639  
Total amortization of finite lived intangible assets $ 278 $ 260      
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Weighted-Average Amortization Period 15 years   15 years    
Finite lived intangible assets: gross carrying amount $ 6,991     7,311  
Accumulated amortization (1,748)     (1,706)  
Finite lived intangible assets: net $ 5,243     5,605  
Trade secrets and processes          
Finite-Lived Intangible Assets [Line Items]          
Weighted-Average Amortization Period 20 years   20 years    
Finite lived intangible assets: gross carrying amount $ 5,256     5,256 $ 5,300
Accumulated amortization (854)     (788)  
Finite lived intangible assets: net $ 4,402     4,468  
Other Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Weighted-Average Amortization Period 5 years   5 years    
Finite lived intangible assets: gross carrying amount $ 1,803     1,885  
Accumulated amortization (1,351)     (1,319)  
Finite lived intangible assets: net 452     $ 566  
Cost of revenue          
Finite-Lived Intangible Assets [Line Items]          
Total amortization of finite lived intangible assets 66 66      
Sales, general and administrative          
Finite-Lived Intangible Assets [Line Items]          
Total amortization of finite lived intangible assets $ 212 $ 194