Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Valuation Allowance (Details)

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INCOME TAXES - Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
INCOME TAXES    
Valuation allowance at beginning of the year $ 87,370 $ 56,405
Increases recorded to income tax provision 25,058 30,965
Decreases recorded as a benefit to income tax provision (934)  
Valuation allowance at end of year $ 111,494 $ 87,370