Consolidated Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements Of Comprehensive Loss [Abstract]
Net loss	$ (13,371)	$ (54,442)	$ (10,242)	$ (71,199)
Other comprehensive income (loss):
Foreign currency translation adjustment	418	(60)	891	(3,251)
Unrealized gain on available-for-sale securities				2,622
Net gain reclassified into income on sale of available-for-sale securities				(3,874)
Other comprehensive income (loss)	418	(60)	891	(4,503)
Comprehensive loss	$ (12,953)	$ (54,502)	$ (9,351)	$ (75,702)