Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (39,378)	$ (21,495)	$ (79,753)	$ (39,323)
Other comprehensive loss:
Unrealized gain on investment securities	8	94	17	46
Foreign currency translation adjustments	(1)		3
Comprehensive loss	$ (39,371)	$ (21,401)	$ (79,733)	$ (39,277)