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Net Income (Loss) per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted net income per share during the three and nine months ended September 30, 2015 and 2014 (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Numerator
 
 
 
 
 
 
 
Net income (loss)
$
5,394

 
$
(4,562
)
 
$
(5,528
)
 
$
(19,416
)
Denominator
 
 
 
 
 
 
 
Weighted average common shares used in computing net income (loss) per share, basic
39,767

 
38,450

 
39,340

 
38,063

Effect of dilutive shares
1,203

 
—

 
—

 
—

Weighted average common shares used in computing net income (loss) per share, diluted
40,970

 
38,450

 
39,340

 
38,063

Net income (loss) per share, basic
$
0.14

 
$
(0.12
)
 
$
(0.14
)
 
$
(0.51
)
Net income (loss) per share, diluted
$
0.13

 
$
(0.12
)
 
$
(0.14
)
 
$
(0.51
)
Securities not included in the net loss per common share calculations
The following shares were not considered in the computation of diluted net loss per share (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Shares issuable under Equity Incentive Plan
—

 
6,398

 
6,121

 
6,398

Shares issuable upon the conversion of warrants
—

 
75

 
75

 
75

Total shares excluded as anti-dilutive
—

 
6,473

 
6,196

 
6,473