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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Aug. 14, 2018
Dec. 31, 2017
Shareholders' equity            
Par value of common stock (in dollars per share)         $ 0.0001  
Increase in additional paid-in capital $ 400,869   $ 400,869     $ 389,015
Stock options            
Option Exercises            
Options exercised during period (in shares) 34,551 50,159 262,443 863,511    
Net proceeds from options exercised during the period $ 200 $ 300 $ 1,500 $ 6,300    
Restricted stock units            
Restricted Stock Units            
Number of shares issued due to vesting (in shares) 2,597 0 204,142 42,068    
Restatement Adjustment            
Shareholders' equity            
Decrease in common stock           313,900
Increase in additional paid-in capital           $ 313,900