Income Taxes - Reconciliation of Differences between United States Statutory Federal Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax computed at the federal statutory rate	21.00%	21.00%
State income taxes, net of federal benefits	1.90%	2.70%
Nondeductible expenses	(0.40%)	(2.00%)
Stock-based compensation	(9.50%)	(2.20%)
Change in valuation allowance	(13.00%)	(19.50%)

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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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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