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Selected Quarterly Financial Data (Unaudited - in thousands except per share data) (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Data (Unaudited - in thousands except per share data)  
Schedule of selected quarterly financial data

Selected Quarterly Financial Data (Unaudited — in thousands except per share data)

                                                                                                                                                                                    

 

 

Quarters Ended

 

 

 

March 31

 

June 30

 

September 30

 

December 31

 

2017

 

 

 

 

 

 

 

 

 

 

 

 

 

Net loss

 

$
(54,992

)

$
(48,136

)

$
(111,666

)

$
(69,208

)

Basic and diluted net loss per common share (1)

 

$
(0.39

)

$
(0.34

)

$
(0.69

)

$
(0.42

)

2016

 

 

 

 

 

 

 

 

 

 

 

 

 

Net loss

 

$
(43,691

)

$
(51,050

)

$
(46,654

)

$
(58,647

)

Basic and diluted net loss per common share (1)

 

 
(0.35

)

 
(0.40

)

 
(0.33

)

 
(0.41

)

 

 

 

(1)          

Per common share amounts for the quarters and full years have been calculated separately. Accordingly, quarterly amounts do not add to the annual amounts because of differences on the weighted-average common shares outstanding during each period principally due to the effect of the Company issuing shares of its common stock during the year.