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Income Taxes - Expected Expiry Dates of NOL's (Details) - United States
$ in Thousands
Dec. 31, 2018
USD ($)
Federal NOL's  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward $ 15,089
Federal NOL's | 2021-2034  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward 14,323
Federal NOL's | 2035-2037  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward 766
State NOL's  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward 32,622
State NOL's | 2021-2034  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward 12,158
State NOL's | 2035-2037  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforward $ 20,464