CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Government contracts	$ 1,946	$ 9,246
Research and development collaborations	2,272	631
Total revenue	4,218	9,877
Expenses:
Research and development	68,952	28,347
General and administrative	10,528	5,843
Total expenses	79,480	34,190
Loss from operations	(75,262)	(24,313)
Other income (expense):
Investment income	473	121
Interest expense	(2,430)	(36)
Other expense	(33)	(142)
Net loss	$ (77,252)	$ (24,370)
Basic and diluted net loss per share (in dollars per share)	$ (0.29)	$ (0.1)
Basic and diluted weighted average number of common shares outstanding (in shares)	270,179	241,223