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ORDINARY SHARE AND SHARE INCENTIVE PLANS - Allocation of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock based compensation expense      
Stock-based compensation expense recognized $ 1,399 $ 1,097 $ 866
Cost of Net Sales      
Stock based compensation expense      
Stock-based compensation expense recognized 136 66 12
Selling, general and administrative      
Stock based compensation expense      
Stock-based compensation expense recognized 985 901 793
Research and development      
Stock based compensation expense      
Stock-based compensation expense recognized $ 278 $ 130 $ 61