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Selected Quarterly Financial Data (Unaudited - in thousands except per share data) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of selected quarterly financial data
 
Quarters Ended
 
March 31
 
June 30
 
September 30
 
December 31
2018
 
 
 
 
 
 
 
Net loss
$
(49,916
)
 
$
(61,833
)
 
$
(159,163
)
 
$
(78,083
)
Basic and diluted net loss per common share (1)
$
(0.28
)
 
$
(0.33
)
 
$
(0.84
)
 
$
(0.43
)
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
)
_____________________________________________________________________
(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.