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COMMON STOCK AND STOCK INCENTIVE PLANS - Allocation of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock based compensation expense      
Stock-based compensation expense recognized $ 1,097 $ 866 $ 2,238
Cost of net sales      
Stock based compensation expense      
Stock-based compensation expense recognized 66 12 1
Selling, general and administrative      
Stock based compensation expense      
Stock-based compensation expense recognized 901 793 2,193
Research and development      
Stock based compensation expense      
Stock-based compensation expense recognized $ 130 $ 61 $ 44