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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
Net loss
$
(7,652
)
 
$
(6,251
)
 
$
(46,077
)
 
$
(21,928
)
Weighted-average common shares outstanding
106,239

 
102,765

 
105,510

 
101,503

Net loss per share - basic and diluted
$
(0.07
)
 
$
(0.06
)
 
$
(0.44
)
 
$
(0.22
)
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, 2019 and 2018 (in thousands):
 
September 30,
 
2019
 
2018
Options to purchase common stock
10,884

 
14,564

Common stock warrants
1,459

 
1,459

Non-vested restricted stock unit awards
6,385

 
5,431

Total shares excluded from net loss per share
18,728

 
21,454