CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive (Loss) Income
Net loss	$ (15,415)	$ (14,879)	$ (31,069)	$ (30,183)
Other comprehensive income, net of tax
Net change in unrealized gains on available-for-sale securities	3	8		67
Other comprehensive income, net of tax	3	8		67
Comprehensive loss	$ (15,412)	$ (14,871)	$ (31,069)	$ (30,116)