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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2016
Dec. 31, 2015
Dec. 31, 2014
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                      
Net (loss) income $ (8,482) $ (3,576) $ (8,637) $ (8,842) $ (8,468) $ 27,185 $ (9,356) $ (9,315) $ (29,537) $ 46 $ (35,670)
Weighted-average shares:                      
Basic (in shares)                 159,045,644 158,036,162 153,540,341
Effect of dilutive securities from stock options and restricted stock awards (in shares)                   4,627,732  
Diluted (in shares)                 159,045,644 162,663,894 153,540,341
Net (loss) income per share:                      
Basic (in dollars per share)                 $ (0.19) $ 0.00 $ (0.23)
Diluted (in dollars per share)                 $ (0.19) $ 0.00 $ (0.23)