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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Shipping and handling costs $ 525 $ 1,625  
Federal tax rate 21.00% 21.00% 35.00%
Uncertain tax positions $ 0 $ 0