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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock based compensation expense      
Stock-based compensation expense recognized $ 866 $ 2,238 $ 1,546
Cost of Sales      
Stock based compensation expense      
Stock-based compensation expense recognized 12 1 40
Selling, General and Administrative Expenses      
Stock based compensation expense      
Stock-based compensation expense recognized 793 2,193 1,392
Research and Development Expense      
Stock based compensation expense      
Stock-based compensation expense recognized $ 61 $ 44 $ 114