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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted 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,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Net loss
$
(9,519
)
 
$
(7,436
)
 
$
(24,374
)
 
$
(33,758
)
Weighted-average common shares outstanding
98,665

 
84,822

 
93,108

 
84,075

Net loss per share - basic and diluted
$
(0.10
)
 
$
(0.09
)
 
$
(0.26
)
 
$
(0.40
)
Anti-dilutive shares excluded from the calculation of diluted net loss per share
The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share at September 30, 2017 and 2016 (in thousands):
 
September 30,
 
2017
 
2016
 
 
 
 
Options to purchase common stock
17,089

 
25,552

Common stock warrants
1,459

 
1,605

Non-vested restricted stock unit awards
4,847

 
4,578

Total shares excluded from net loss per share
23,395

 
31,735