Annual report pursuant to Section 13 and 15(d)

Income Taxes - NOL carryforwards (Details)

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Income Taxes - NOL carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Indefinite Carryforward Period    
Operating Loss Carryforwards [Line Items]    
NOL carryforwards $ 51.7  
Expire at Various Dates Through 2037    
Operating Loss Carryforwards [Line Items]    
NOL carryforwards   $ 135.7
Federal    
Operating Loss Carryforwards [Line Items]    
NOL carryforwards 187.5  
Tax credits 8.8  
State    
Operating Loss Carryforwards [Line Items]    
NOL carryforwards 189.6  
Tax credits $ 2.3