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NONVESTED SHARES - Summary of Nonvested Shares Granted and Vested (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted average grant date fair value              
Incremental compensation expenses $ 2,060 $ 405 $ 1,865        
2008 Plan | Nonvested shares              
Number of Shares              
Outstanding at the beginning of the period (in shares) 548,780            
Granted (in shares) 1,829,000 244,000 272,000 296,000 3,154,800 2,800,300 711,571
Forfeited (in shares) (104,476)            
Vested (in shares) (1,813,304)            
Outstanding at the end of the period (in shares) 460,000 548,780          
Weighted average grant date fair value              
Outstanding at the beginning of the period (in dollars per share) $ 5.07            
Granted (in dollars per share) 0.54            
Forfeited (in dollars per share) 1.52            
Vested (in dollars per share) 0.54            
Outstanding at the end of the period (in dollars per share) $ 5.74 $ 5.07          
Fair value of shares vested $ 972 $ 379 $ 808        
Incremental compensation expenses 1,995 $ 384 $ 1,768        
Unrecognized compensation cost $ 327            
Weighted-average period of recognition of unrecognized compensation cost 1 year 9 months 26 days