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Net Income (Loss) per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic
The following table sets forth the computation of basic and diluted net income (loss) per share during three and six months ended June 30, 2016 and 2015 (in thousands, except per share amounts):

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
2,239

 
$
(5,360
)
 
$
(4,735
)
 
$
(10,922
)
Denominator:
 
 
 
 
 
 
 
Weighted average common stock shares used in computing net income (loss) per share, basic
40,495

 
39,301

 
40,283

 
39,066

Effect of dilutive shares
1,073

 
—

 
—

 
—

Weighted average common stock shares used in computing net income (loss) per share, diluted
41,568

 
39,301

 
40,283

 
39,066

Net income (loss) per share, basic
$
0.06

 
$
(0.14
)
 
$
(0.12
)
 
$
(0.28
)
Net income (loss) per share, diluted
$
0.05

 
$
(0.14
)
 
$
(0.12
)
 
$
(0.28
)
Schedule of earnings per share, diluted
The following table sets forth the computation of basic and diluted net income (loss) per share during three and six months ended June 30, 2016 and 2015 (in thousands, except per share amounts):

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
2,239

 
$
(5,360
)
 
$
(4,735
)
 
$
(10,922
)
Denominator:
 
 
 
 
 
 
 
Weighted average common stock shares used in computing net income (loss) per share, basic
40,495

 
39,301

 
40,283

 
39,066

Effect of dilutive shares
1,073

 
—

 
—

 
—

Weighted average common stock shares used in computing net income (loss) per share, diluted
41,568

 
39,301

 
40,283

 
39,066

Net income (loss) per share, basic
$
0.06

 
$
(0.14
)
 
$
(0.12
)
 
$
(0.28
)
Net income (loss) per share, diluted
$
0.05

 
$
(0.14
)
 
$
(0.12
)
 
$
(0.28
)
Securities not included in the net loss per common share calculations
The following shares were not considered in the computation of diluted net income (loss) per share because their effect was anti-dilutive (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Shares of common stock issuable pursuant to equity awards outstanding under the Equity Incentive Plan
2,574

 
6,595

 
5,645

 
6,595

Shares of common stock issuable upon exercise of outstanding warrants
73

 
75

 
73

 
75

Total shares excluded as anti-dilutive
2,647

 
6,670

 
5,718

 
6,670