Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating expenses:
General and administrative	$ 11,039	$ 7,871
Research and development	60,207	44,728
Totals	71,246	52,599
Loss from operations	(71,246)	(52,599)
Other (expenses) income:
Interest income	282	123
Other (expenses) income	(8)	22
Totals	274	145
Net loss	(70,972)	(52,454)
Net loss applicable to common stock	$ (70,972)	$ (52,454)
Net loss per common share—basic and diluted	$ (2.19)	$ (1.66)
Weighted-average common shares outstanding—basic and diluted	32,478,408	31,588,315