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Net Loss Per Share
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Net loss per share
Net Loss Per Share
The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): 
 
Three Months Ended 
 June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Net loss
$
(14,739
)
 
$
(15,034
)
 
$
(26,362
)
 
$
(24,955
)
Weighted-average common shares outstanding
82,012

 
67,784

 
81,241

 
63,962

Net loss per share - basic and diluted
$
(0.18
)
 
$
(0.22
)
 
$
(0.32
)
 
$
(0.39
)

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share at June 30, 2015 and 2014 (in thousands):
 
June 30,
 
2015
 
2014
 
 
 
 
Options to purchase common stock
25,350

 
26,665

Common stock warrants
2,492

 
3,981

Non-vested restricted stock awards
1,271

 
741

Total shares excluded from net loss per share
29,113

 
31,387