Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (11,226)	$ (9,158)
Other comprehensive income, net of tax
Unrealized gain on marketable securities	270	42
Comprehensive loss	$ (10,956)	$ (9,116)