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Income Taxes - Net Operating Loss Carry Forward (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Operating Loss Carryforwards [Line Items]  
Market capitalization used in net operating loss analysis $ 125.0
Annual limitation on usage of net operating losses 3.0
Federal  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 264.0
State and Local Jurisdiction | New Jersey Division of Taxation  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 99.0
State and Local Jurisdiction | California Franchise Tax Board  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 70.0
State and Local Jurisdiction | New York State Division of Taxation and Finance  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 13.0