INCOME TAXES - Schedule of Income Tax Reconciliation (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	21.00%	34.00%
State income taxes, net of federal benefit	0.00%	0.00%	5.80%
Stock-based compensation	2.20%	(0.20%)	(0.70%)
Permanent adjustments	(0.10%)	(0.10%)	4.20%
Change to valuation allowance	(25.90%)	(21.90%)	(19.60%)
Tax Cuts and Jobs Act Impact	0.00%	0.00%	(25.40%)
Research and development credits	2.80%	1.30%	1.60%
Net unrealized gain on available-for-sale investments	0.10%	0.00%	0.00%
Other	0.00%	(0.10%)	0.00%
Effective tax rate	0.10%	0.00%	0.00%

Effective Income Tax Rate Reconciliation, Net Unrealized Gain (Loss) On Available For Sale Investments

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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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