NET LOSS PER SHARE - BASIC AND DILUTED NET INCOME (LOSS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Loss from continuing operations	$ (14,845)	$ (6,205)	$ (27,710)	$ (8,900)
Income from discontinued operations, net of tax	0	649	0	649
Net loss	$ (14,845)	$ (5,556)	$ (27,710)	$ (8,251)
Denominator:
Shares used in computation of basic and diluted net loss per share (weighted average common shares outstanding)	29,193	28,834	29,109	28,663
Basic and diluted net loss per share - Continuing operations (in dollars per share)	$ (0.51)	$ (0.22)	$ (0.95)	$ (0.31)
Basic and diluted net loss per share - Discontinued operations (in dollars per share)	0.00	0.02	0.00	0.02
Basic and diluted net loss per share (in dollars per share)	$ (0.51)	$ (0.20)	$ (0.95)	$ (0.29)