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GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 23,045 $ 17,222
Less: Accumulated amortization (10,993) (6,549)
Add: Currency translation adjustment 35 22
Total intangible assets, net 12,087 10,695
Amortization 4,500 3,100
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 500 500
Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 22,545 16,722
Amortization $ 4,000 $ 3,000