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FAIR VALUE MEASUREMENTS - The Group's financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Marketable securities   $ 0
Fair Value, Measurements, Recurring [Member]    
Marketable securities $ 19,602  
Financial liabilities related to foreign currency derivative hedging contracts (293)  
Earn out liability related to the acquisition of ACS (433)  
Total financial net assets (liabilities) 18,876  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Marketable securities 19,602  
Financial liabilities related to foreign currency derivative hedging contracts (293)  
Total financial net assets (liabilities) 19,309  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Earn out liability related to the acquisition of ACS (433)  
Total financial net assets (liabilities) $ (433)