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Net Loss Per Share
 9 Months Ended
Sep. 30, 2018
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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Net loss
$
(6,251
)
 
$
(9,519
)
 
$
(21,928
)
 
$
(24,374
)
Weighted-average common shares outstanding
102,765

 
98,665

 
101,503

 
93,108

Net loss per share - basic and diluted
$
(0.06
)
 
$
(0.10
)
 
$
(0.22
)
 
$
(0.26
)

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share at September 30, 2018 and 2017 (in thousands):
 
September 30,
 
2018
 
2017
 
 
 
 
Options to purchase common stock
14,564

 
17,089

Common stock warrants
1,459

 
1,459

Non-vested restricted stock unit awards
5,431

 
4,847

Total shares excluded from net loss per share
21,454

 
23,395