NET LOSS PER SHARE - ADDITIONAL INFORMATION (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ (6,205)	$ 1,595	$ (8,900)	$ 1,536
Income from discontinued operations	649	0	649	0
Net income (loss) used in computing basic net income (loss) per share	$ (5,556)	$ 1,595	$ (8,251)	$ 1,536
Shares used in computation of basic and diluted net income (loss) per share (weighted average common shares outstanding)	28,834,000	28,070,000	28,663,000	27,944,000
Stock options, ESPP, restricted Stock and RSUs	0	836,000	0	835,000
Shares used in computation of diluted net income (loss) per share	28,834,000	28,906,000	28,663,000	28,779,000
Basic net income (loss) per share - Continuing operations (in dollars per share)	$ (0.22)	$ 0.06	$ (0.31)	$ 0.05
Basic net income (loss) per share - Discontinued operations (in dollars per share)	0.02	0.00	0.02	0.00
Basic net income (loss) per share (in dollars per share)	(0.20)	0.06	(0.29)	0.05
Diluted net income (loss) per share - Continuing Operations (in dollars per share	(0.22)	0.06	(0.31)	0.05
Diluted net income (loss) per share - Discontinued operations (in dollars per share)	0.02	0.00	0.02	0.00
Diluted net income (loss) per share (in dollars per share)	$ (0.20)	$ 0.06	$ (0.29)	$ 0.05
Options to purchase shares of common stock (in shares)	1,300,000		2,100,000
Average fair market value of stock (in dollars per share)	$ 11.28		$ 10.08
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			3,521,481
Unvested restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			77,540
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			510,234
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)			27,670