NET INCOME (LOSS) PER SHARE (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted loss per share

The following table sets forth the computation of basic and diluted net income (loss) per share for the three and six months ended June 30, 2015 and 2014 (in thousands, except per share amounts):

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2015		2014			2015		2014
Numerator:
Net income (loss)	$	8	$	(5,037	)	$	1,268	$	(16,514	)
Denominator:
Weighted average shares of common stock outstanding—basic	36,481		35,463			36,358		34,587
Computation of diluted securities:
Dilutive effect of stock options	1,680		—			1,782		—
Dilutive effect of conversion premium on the Notes	3,277		—			3,465		—
Dilutive effect of warrants	6		—			6		—
Dilutive effect of employee stock purchase plan	1		—			1		—
Weighted average shares of common stock outstanding—diluted	41,445		35,463			41,612		34,587
Net income (loss) per share:
Basic and diluted net income (loss) per share of common stock	$	0.00	$	(0.14	)	$	0.03	$	(0.48	)

Schedule of potential dilutive effect of the securities excluded from the calculation of diluted loss per share

The following outstanding stock options, conversion premium on the Notes and warrants are antidilutive in the periods presented (in thousands): 

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2015	2014	2015	2014
Weighted average number of stock options	1,738	4,146	1,530	4,006
Conversion premium on the Notes	—	3,259	—	3,165
Weighted average number of warrants	—	46	—	52
Total	1,738	7,451	1,530	7,223