CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (5,994)	$ (9,152)	$ (20,436)	$ (33,261)
Other comprehensive loss:
Unrealized gain (loss) on securities, net of taxes	125	(158)	359	469
Comprehensive loss	$ (5,869)	$ (9,310)	$ (20,077)	$ (32,792)