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Income Taxes - Net Operating Loss Carryforwards (Details)
$ in Thousands, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Net operating loss carryforwards      
Operating loss carryforwards available to offset future taxable income $ 50,272   $ 39,907
Australian      
Net operating loss carryforwards      
Net operating loss carryforwards 2,800 $ 3.7  
State      
Net operating loss carryforwards      
Net operating loss carryforwards 214,300    
Federal      
Net operating loss carryforwards      
Net operating loss carryforwards 222,800    
Operating loss carryforwards available to offset future taxable income 78,700    
Net operating loss carryforwards with no expiration $ 144,100