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Net Loss Per Share
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Net loss
$
(6,622
)
 
$
(8,060
)
 
$
(15,677
)
 
$
(14,855
)
Weighted-average common shares outstanding
101,150

 
93,745

 
100,862

 
90,283

Net loss per share - basic and diluted
$
(0.07
)
 
$
(0.09
)
 
$
(0.16
)
 
$
(0.16
)

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share at June 30, 2018 and 2017 (in thousands):
 
June 30,
 
2018
 
2017
 
 
 
 
Options to purchase common stock
16,687

 
18,986

Common stock warrants
1,459

 
1,459

Non-vested restricted stock unit awards
5,899

 
5,319

Total shares excluded from net loss per share
24,045

 
25,764