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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information The table below sets forth certain unaudited statements of comprehensive income (loss) data, and net income (loss) per common share data, for each quarter of 2019 and 2018:
 
(in thousands, except per share data)
 Quarter Ended
 March 31June 30September 30December 31
  (Unaudited) 
2019    
Revenues (1)$9,216  $9,682  $294,448  $8,727  
Income (loss) from operations$(17,469) $(18,545) $224,676  $(47,217) 
Net income (loss)$(21,797) $(23,018) $226,086  $(51,138) 
Net income (loss) per common share, basic$(0.21) $(0.22) $2.13  $(0.48) 
Net income (loss) per common share, diluted$(0.21) $(0.22) $1.95  (0.48) 
   Shares used in computing net income (loss) per common share, basic
106,054  106,272  106,272  106,272  
Shares used in computing net income (loss) per common share, diluted106,054  106,272  116,640  106,272  
2018    
Revenues$25,374  $13,798  $6,966  $17,071  
Loss from operations$(37,713) $(30,272) $(22,927) $(12,367) 
Net loss$(41,821) $(34,549) $(27,396) $(16,782) 
Net loss per common share, basic and diluted$(0.40) $(0.33) $(0.26) $(0.16) 
Shares used in computing net loss per common share, basic and diluted
105,668  105,848  105,881  105,920