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Income Taxes - Sale of New Jersey Net Operating Losses (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2016
Dec. 31, 2018
Net Operating Losses | State      
Sale of New Jersey Net Operating Losses      
NOLs     $ 78.1
Research and Development | State      
Sale of New Jersey Net Operating Losses      
Tax credits     $ 1.3
Sale of unused NOLs and research and development credits | New Jersey      
Sale of New Jersey Net Operating Losses      
Maximum lifetime benefit under the Program $ 15.0    
Net proceeds from sale of NOL and tax credit   $ 3.0  
Sale of unused NOLs and research and development credits | New Jersey | Minimum      
Sale of New Jersey Net Operating Losses      
Allowable sale of unused tax benefits as a percentage of total value 80.00%    
Sale of unused NOLs and research and development credits | Net Operating Losses | New Jersey      
Sale of New Jersey Net Operating Losses      
NOLs $ 0.5 28.2  
Sale of unused NOLs and research and development credits | Research and Development | New Jersey      
Sale of New Jersey Net Operating Losses      
Tax credits   $ 0.8