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Prepaid and other current assets - Schedule of prepaid and other current assets consisted of the following (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Insurance $ 3,801 $ 2,568
Paragraph IV legal proceeding costs 2,858  
Other 3,715 4,975
Prepaid and other current assets $ 10,374 $ 7,543