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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
NOL carryforwards      
Income tax provision (benefit) $ 201,000 $ (272,000) $ 98,000
Effective tax rate 0.00% 0.00% 0.00%
Unrecognized tax benefits, interest and penalties accrued   $ 0  
Net deferred tax assets (prior to applying the valuation allowance) $ 332,605,000 261,300,000  
Increase (decrease) in valuation allowance 71,300,000 (23,300,000)  
Federal      
NOL carryforwards      
Net operating loss carryforwards for income tax purposes 880,600,000    
Net operating loss carryforwards available to offset future taxable income 709,700,000    
State and Local      
NOL carryforwards      
Net operating loss carryforwards available to offset future taxable income   $ 1,300,000  
New Jersey Division of Taxation      
NOL carryforwards      
Net operating loss carryforwards available to offset future taxable income $ 515,300,000