CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net loss	$ (55,868)	$ (38,755)	$ (43,337)
Other comprehensive income (loss):
Unrealized gains (losses) on available-for-sale investments, net of tax effect of $3,825, zero and zero for 2015, 2014, and 2013, respectively	7,320	(38)	7
Comprehensive loss	$ (48,548)	$ (38,793)	$ (43,330)