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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating expenses:        
Research and development $ 23,104 $ 11,239 $ 40,468 $ 19,592
General and administrative 7,038 2,422 11,176 4,408
Total operating expenses 30,142 13,661 51,644 24,000
Loss from operations (30,142) (13,661) (51,644) (24,000)
Other income (expense), net:        
Interest income 456 149 729 242
Other expense, net (101) (73) (251) (3,457)
Total other income (expense), net 355 76 478 (3,215)
Net loss (29,787) (13,585) (51,166) (27,215)
Net loss attributable to common stockholders $ (29,787) $ (13,585) $ (51,166) $ (32,023)
Net loss per share attributable to common stockholders, basic and diluted $ (0.83) $ (0.45) $ (1.46) $ (1.25)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted 35,937,442 30,055,943 34,977,498 25,697,407