INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%
State taxes, net of federal benefit	3.16%	3.71%
Research and development tax credits	3.25%	8.77%
Permanent differences and other	(2.51%)	2.36%
Transaction costs	(1.88%)	0.00%
Stock-based compensation	(1.02%)	0.00%
Change in tax rate	0.02%	1.80%
Change in deferred tax asset valuation allowance	(22.02%)	(37.64%)
Effective income tax rate	0.00%	0.00%

Effective Income Tax Rate Reconciliation, Transaction Costs, Percent

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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 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 expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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