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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of financial instruments measured at fair value on recurring basis
Financial instruments measured at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 are classified based on the valuation technique in the table below (in thousands):

 June 30, 2021 
Fair Value Measurements Using
Quoted Prices
 in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Assets:
Money market accounts$70,620 $— $— $70,620 
Total assets at fair value (1)
$70,620 $— $— $70,620 
(1) The above table excludes $36.7 million of cash held in banks.

 
 December 31, 2020 
Fair Value Measurements Using
Quoted Prices 
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Assets:
Money market accounts45,614 $— $— $45,614 
Total assets at fair value (2)
$45,614 $— $— 0$45,614 
(2) The above table excludes $13.9 million of cash held in banks.