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INCOME TAXES - Rollforward of uncertain tax position (Details 3) - Research and development tax credits - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Uncertain tax positions roll foreword      
Uncertain tax positions $ 1,032 $ 2,945 $ 2,945
Increase due to positions taken in prior periods  
Decrease due to completion of IRS examination   (1,913)  
Uncertain tax positions $ 1,032 $ 1,032 $ 2,945