CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive (Loss) Income
Net loss	$ (15,654)	$ (15,304)
Other comprehensive (loss) income, net of tax
Net change in unrealized (losses) gains on available-for-sale securities	(3)	59
Other comprehensive (loss) income, net of tax	(3)	59
Comprehensive loss	$ (15,657)	$ (15,245)