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NET (LOSS) INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share                              
Net (loss) income $ 2,169 $ (8,072) $ (1,712) $ (3,018) $ (4,491) $ 4,208 $ 8,353 $ 12,985 $ (14,988) $ 2,633 $ (14,116) $ 6,021 $ (10,634) $ 21,055 $ (20,450)
Weighted average number of common shares 313,887 314,077 308,523 299,575 299,518 298,510 298,237 298,242 300,107 300,530 300,530 297,255 313,887 298,772 300,341
Effect of employee stock-based awards                           1,702  
Diluted shares outstanding 313,887 314,077 308,523 299,575 301,102 301,045 299,791 298,554 300,107 300,530 300,530 297,266 313,887 300,474 300,341
Net income (loss) per share:                              
Basic (in dollars per share) $ 0.01 $ (0.03) $ (0.01) $ (0.01) $ (0.01) $ 0.01 $ 0.03 $ 0.04 $ (0.05) $ 0.01 $ (0.05) $ 0.02 $ (0.03) $ 0.07 $ (0.07)
Diluted (in dollars per share) 0.01 $ (0.03) $ (0.01) $ (0.01) $ (0.01) $ 0.01 $ 0.03 $ 0.04 $ (0.05) $ 0.01 $ (0.05) $ 0.02 $ (0.03) $ 0.07 $ (0.07)
Options                              
Antidilutive Securities Excluded from Computation of Earnings Per Share                              
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)                           2,200  
Average exercise price of options outstanding (in dollars per share)                           $ 3.97  
Warrants                              
Antidilutive Securities Excluded from Computation of Earnings Per Share                              
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)                         10,350    
Price per common share for each warrant $ 2.70                       $ 2.70