NET INCOME (LOSS) PER SHARE - ADDITIONAL INFORMATION (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ 7,018	$ 184	$ (1,882)	$ 1,720
Income from discontinued operations, net of tax	0	0	649	0
Net income (loss) used in computing basic net income (loss) per share	$ 7,018	$ 184	$ (1,233)	$ 1,720
Shares used in computation of basic and diluted net income (loss) per share (weighted average common shares outstanding)	28,849,000	28,190,000	28,726,000	28,027,000
Stock options, ESPP, restricted Stock and RSUs	449,000	944,000	0	866,000
Shares used in computation of diluted net income (loss) per share	29,298,000	29,134,000	28,726,000	28,893,000
Basic net income (loss) per share - Continuing operations (in dollars per share)	$ 0.24	$ 0.01	$ (0.07)	$ 0.06
Basic net income (loss) per share - Discontinued operations (in dollars per share)	0.00	0.00	0.02	0.00
Basic net income (loss) per share (in dollars per share)	0.24	0.01	(0.05)	0.06
Diluted net income (loss) per share - Continuing Operations (in dollars per share	0.24	0.01	(0.07)	0.06
Diluted net income (loss) per share - Discontinued operations (in dollars per share)	0.00	0.00	0.02	0.00
Diluted net income (loss) per share (in dollars per share)	$ 0.24	$ 0.01	$ (0.05)	$ 0.06
Options to purchase shares of common stock (in shares)	2,700,000	917,000		1,800,000
Average fair market value of stock (in dollars per share)	$ 7.41	$ 12.13		$ 10.78
Standard and market condition stock options outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			3,661,163
Restricted stock awards outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			77,540
RSUs outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			527,410
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			11,441