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Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 21, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
U.S. federal corporate income tax rate (percent)		21.00%
Market capitalization used in net operating loss analysis		$ 125.0
Annual limitation on usage of net operating losses		3.0
Sale Of Net Operating Losses, NJEDA Program, Value	$ 11.5
Proceeds From Sale Of Net Operating Losses, NJEDA Program	$ 10.9
Federal
Income Taxes [Line Items]
Net operating loss carryforwards		264.0	$ 246.0
State | New Jersey
Income Taxes [Line Items]
Net operating loss carryforwards		99.0	187.0
State | California
Income Taxes [Line Items]
Net operating loss carryforwards		70.0	70.0
State | New York
Income Taxes [Line Items]
Net operating loss carryforwards		$ 13.0	$ 13.0

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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