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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Net loss
$
(8,060
)
 
$
(14,655
)
 
$
(14,855
)
 
$
(26,322
)
Weighted-average common shares outstanding
93,745

 
83,931

 
90,283

 
83,697

Net loss per share - basic and diluted
$
(0.09
)
 
$
(0.17
)
 
$
(0.16
)
 
$
(0.31
)
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 June 30, 2017 and 2016 (in thousands):
 
June 30,
 
2017
 
2016
 
 
 
 
Options to purchase common stock
18,986

 
23,785

Common stock warrants
1,459

 
1,605

Non-vested restricted stock unit awards
5,319

 
4,923

Total shares excluded from net loss per share
25,764

 
30,313