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Settlement Agreement (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Apr. 19, 2018
USD ($)
installment
Loss Contingencies [Line Items]        
Other current assets   $ 16,087 $ 13,144  
Settlement Agreement        
Loss Contingencies [Line Items]        
Aggregate net payments to be received       $ 15,700
Number of equal installments payable | installment       4
Settlement income $ 14,800      
Other current assets   $ 7,800 $ 7,800