Annual report pursuant to Section 13 and 15(d)

REVENUE - Narrative (Details)

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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]          
Interest income from secured loans issued $ 800 $ 600 $ 600    
Contract liabilities, net (current) $ 1,494 $ 1,912   $ 1,800 $ 2,200