NET INCOME (LOSS) PER SHARE - BASIC AND DILUTED NET INCOME (LOSS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Income (loss) from continuing operations	$ (5,287)	$ 7,018		$ (32,997)	$ (1,882)
Income from discontinued operations, net of tax	0	0	$ 649	0	649
Net income (loss)	$ (5,287)	$ 7,018		$ (32,997)	$ (1,233)
Denominator:
Shares used in computation of basic net income (loss) per share (weighted average common shares outstanding)	29,245	28,849		29,155	28,726
Stock options, ESPP, Restricted Stock and RSUs (in shares)	0	449		0	0
Shares used in computation of diluted net income (loss) per share (weighted average common shares outstanding)	29,245	29,298		29,155	28,726
Basic net income (loss) per share:
Basic net loss per share - Continuing operations (in dollars per share)	$ (0.18)	$ 0.24		$ (1.13)	$ (0.07)
Basic net loss per share - Discontinued operations (in dollars per share)	0.00	0.00		0.00	0.02
Basic net loss per share (in dollars per share)	(0.18)	0.24		(1.13)	(0.05)
Diluted net income (loss) per share:
Diluted net loss per share - Continuing operations (in dollars per share)	(0.18)	0.24		(1.13)	(0.07)
Diluted net loss per share - Discontinued operations (in dollars per share)	0.00	0.00		0.00	0.02
Diluted net loss per share (in dollars per share)	$ (0.18)	$ 0.24		$ (1.13)	$ (0.05)
Options to purchase shares of common stock (in shares)		2,700
Average fair value price per share of common stock (in dollars per share)		$ 7.41