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Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Net Loss Per Share

Basic and diluted loss per share was calculated as follows:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(In thousands)

 

Net loss

 

$

(85,343

)

 

$

(67,543

)

 

$

(31,634

)

Weighted average shares outstanding, basic

   and diluted

 

 

43,069

 

 

 

36,006

 

 

 

22,222

 

Net loss per share, basic and diluted

 

$

(1.98

)

 

$

(1.88

)

 

$

(1.42

)

Potential Dilutive Securities Excluded from Computation of Diluted Net Loss Per Common Share

The following common stock equivalents were excluded from the calculation of diluted loss per share in 2018, 2017 and 2016 because their inclusion would have been anti-dilutive:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(In thousands)

 

Unvested restricted stock

 

 

109

 

 

 

480

 

 

 

1,362

 

Stock options

 

 

5,038

 

 

 

4,705

 

 

 

3,040

 

 

 

 

5,147

 

 

 

5,185

 

 

 

4,402