Income Taxes - Reconciliation of Total Income Tax Provision Tax Rate to Statutory Federal Income Tax Rate (Details)	10 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes at statutory rates	34.00%	21.00%
State income tax, net of federal benefit	0.00%	0.00%
Permanent items	(10.92%)	(9.76%)
Tax law change - tax reform	(8.78%)	0.00%
Federal research credit	0.41%	1.68%
Change in federal valuation allowance	(14.71%)	(12.92%)
Effective rate	0.00%	0.00%

Effective income tax rate reconciliation permanent items.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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