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L. SHARE-BASED COMPENSATION - RESTRICTED STOCK UNITS (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of shares      
Outstanding, beginning balance 152 21 33
Granted 497 156 25
Released (122) (19) (33)
Cancelled/Forfeited (10) (6) (4)
Outstanding, ending balance 517 152 21
Exercisable, ending balance 25    
Vested and expected to vest 501    
Weighted Average Share Price On Date Of Granted   $ 13.62  
Weighted Average Share Price on Date of Release $ 13.50    
Weighted Average Fair Value      
Outstanding, beginning balance 11.20 18.22 $ 10.00
Granted 15.73 11.06 18.45
Released 14.08 18.24 10.57
Cancelled/Forfeited 15.38 10.00 18.20
Outstanding, ending balance 14.79 $ 11.20 $ 18.22
Exercisable, ending balance 11.41    
Vested and expected to vest $ 14.77    
Aggregate Intrinsic Value [Abstract]      
Aggregate intrinsic value, outstanding $ 2,611 $ 238  
Granted 7,815 1,722  
Released 1,644 257  
Cancelled/Forfeited 180 99  
Aggregate intrinsic value, outstanding 12,128 $ 2,611 $ 238
Exercisable, ending balance 575    
Vested and expected to vest $ 11,752