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CONTRACT LIABILITIES (Tables)
6 Months Ended
Jun. 30, 2020
CONTRACT LIABILITIES [Abstract]  
Summary of Net Changes in Contract Liabilities
A summary of the net changes in contract liabilities activity for the six months ended June 30, 2020 and 2019 is presented below:

 
As of June 30,
 
2020
 
2019
Beginning balance as January 1,
$
26,823
 
$
442,630
Issued
 
42,611
  
64,452
Redeemed
 
(47,580)
  
(67,781)
Breakage recognized
 
(244)
  
(1,222)
Fulfillment of contract
 
(224)
  
(270,698)
Ending balance as of June 30,
$
21,386
 
$
167,381