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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock based compensation expense      
Stock-based compensation expense recognized $ 2,238 $ 1,546 $ 2,289
Cost of Sales      
Stock based compensation expense      
Stock-based compensation expense recognized 1 40 60
Selling, General and Administrative Expenses      
Stock based compensation expense      
Stock-based compensation expense recognized 2,193 1,392 2,185
Research and Development Expense      
Stock based compensation expense      
Stock-based compensation expense recognized $ 44 $ 114 $ 44