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NET INCOME (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2014
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 loss per share for the years ended December 31, 2014, 2013 and 2012 (in thousands except per share amounts):
 
Year Ended December 31,
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Net loss
$
(13,716
)
 
$
(63,909
)
 
$
(52,281
)
Denominator:
 
 
 
 
 
Weighted average shares of common stock outstanding
35,299

 
33,182

 
30,332

Net loss per share:
 
 
 
 
 
Basic and diluted net loss per share of common stock
$
(0.39
)
 
$
(1.93
)
 
$
(1.72
)
Schedule of potential dilutive effect of the securities excluded from the calculation of diluted loss per share
 
Year Ended December 31,
 
2014
 
2013
 
2012
Weighted average number of stock options outstanding
3,534

 
3,980

 
3,304

Conversion premium on the Notes
2,483

 
1,194

 
—

Weighted average number of warrants outstanding
21

 
204

 
585

Weighted average purchase options under ESPP
1

 
—

 
—

     Total
6,039

 
5,378

 
3,889