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SHARE-BASED COMPENSATION - Stock Options, Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Stock options      
Proceeds from exercise of stock options $ 5,000    
Stock Options      
Stock Options Granted      
Outstanding (in shares) 18,233    
Granted (in shares) 4,003 600  
Exercised options (in shares) (4) 0  
Canceled or forfeited (in shares) (71)    
Outstanding (in shares) 22,161   18,233
Vested and expected to vest (in shares) 19,149    
Exercisable (in shares) 9,573    
Weighted Average Exercise Price      
Outstanding (in dollars per share) $ 6.02    
Granted (in dollars per share) 3.29    
Exercised options (in dollars per share) 2.20    
Canceled or forfeited (in dollars per share) 5.56    
Outstanding (in dollars per share) 5.53   $ 6.02
Vested and expected to vest (in dollars per share) 5.68    
Exercisable (in dollars per share) $ 7.12    
Weighted Average Life Remaining      
Outstanding 6 years 10 months 24 days   6 years 4 months 24 days
Vested and expected to vest 6 years 8 months 12 days    
Exercisable 4 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding (in dollars) $ 20,511,000   $ 2,387,000
Vested and expected to vest (in dollars) 16,465,000    
Exercisable (in dollars) $ 2,186,000    
Stock options      
Weighted average grant date fair value (in dollars per share) $ 1.81 $ 1.28  
Total intrinsic value of options exercised $ 6,132    
Unrecognized compensation expense $ 15,300,000 $ 15,000,000  
Weighted-average period for recognition of unrecognized compensation expense 2 years 6 months 2 years 6 months  
Non-cash compensation expense $ 1,300,000 $ 1,000,000  
Proceeds from exercise of stock options $ 8,554 $ 0