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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net (loss) income	$ (7,429)	$ (6,899)	$ (6,405)	$ (7,183)	$ (8,482)	$ (3,576)	$ (8,637)	$ (8,842)	$ (27,916)	$ (29,537)	$ 46
Weighted-average shares:
Basic									159,224,986	159,045,644	158,036,162
Effect of dilutive securities from stock options and restricted stock awards											4,627,732
Diluted									159,224,986	159,045,644	162,663,894
Net (loss) income per share:
Basic									$ (0.18)	$ (0.19)	$ 0.00
Diluted									$ (0.18)	$ (0.19)	$ 0.00

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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