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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INCOME TAXES    
Income tax expense (Benefit) $ 5,211 $ (8)
U.S. statutory rate 21.00% 21.00%
Deferred tax assets $ 0 $ 5,171
Valuation allowance 6,325 0
Research and development credits 4,975 $ 4,689
Pre Tax Gain (Loss) (3,100)  
Uncertain tax positions $ 800