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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 |  |

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