SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure Calculation Of Basic And Diluted Net Income Per Share [Abstract]
Net loss	$ (3,127)	$ (3,884)
Weighted average shares – basic	(49,866)	(46,562)
Effect of dilutive potential common shares	0	0
Weighted average shares – diluted	49,866	46,562
Net loss per share – basic	$ (0.06)	$ (0.08)
Net loss per share – diluted	$ (0.06)	$ (0.08)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,178	2,126