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ACQUIRED INTANGIBLE ASSETS, NET
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
ACQUIRED INTANGIBLE ASSETS, NET
9. ACQUIRED INTANGIBLE ASSETS, NET
December 31,
2021		December 31,
2022
Cost of acquired intangible assets$4,104 $3,493 
Less: accumulated amortization(2,222)(1,857)
Acquired intangible assets, net$1,882 $1,636 
The Group recorded amortization expense of $392, $413 and $244 for the years ended December 31, 2020, 2021 and 2022, respectively. No impairment losses were recognized for the years ended December 31, 2020, 2021 and 2022.
The annual amortization expense for each of the five succeeding fiscal years and thereafter are as follows:
2023$243 
2024237 
2025233 
2026231 
2027231 
Thereafter461 
Total$1,636