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OTHER LONG TERM ASSETS
 12 Months Ended
Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
OTHER LONG TERM ASSETS OTHER LONG-TERM ASSETS
The following table reflects other long-term assets as of December 31, 2022 and 2021 (in thousands): 

December 31,
 20222021
Investment, net$268 $1,579 
Operating lease right-of-use assets137 735 
Prepaid asset and deposits1,607 2,456 
Other697 698 
Total other long-term assets$2,709 $5,468 

Investment, net primarily includes the Company’s investment in NES Therapeutic, Inc. (“NES”). In August 2018, the Company entered into a Convertible Secured Note Purchase Agreement (the “Note Agreement”) with NES. Pursuant the terms of the Note Agreement, the Company purchased a $3.0 million aggregate principal Convertible Secured Promissory Note (the “NES Note”) which accrues interest annually at a rate of 10% for total consideration of $3.0 million, with both the aggregate principal and accrued interest due at maturity on August 2, 2024. Pursuant to the Note Agreement, the NES Note is convertible into equity based on (i) U.S. Food and Drug Administration (“FDA”) acceptance of the New Drug Application (“NDA”), (ii) initiation of any required clinical trials by NES, or (iii) a qualified financing event by NES, as defined in the Note Agreement. This investment is accounted as a long-term loan receivable and is valued at amortized cost. As of December 31, 2022, the Company has assessed an estimated $3.7 million expected credit loss on its investment based on its evaluation of probability of default that exists. The expected credit loss recognized represents the entire aggregate principal amount and outstanding interest incurred on the NES Note as of December 31, 2022. The amount of credit loss related to the NES Note that was recognized in the year ended December 31, 2022 was $1.6 million and is included in Other loss (gain) in the consolidated statements of comprehensive income (loss). There was no credit loss related to the NES note recognized in the year ended December 31, 2021.