CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (11,525)	$ (11,029)	$ (23,570)	$ (18,476)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of income tax benefit of $21 and $16 for the three months ended June 30, 2016 and 2015, respectively, and net of income tax benefit (expense) of $21 and ($44) for the six months ended June 30, 2016 and 2015, respectively	68	(24)	(33)	45
Unrealized (loss) gain on available-for-sale securities, net of income tax (expense) of ($33) and $0 for the three months ended June 30, 2016 and 2015, respectively, and net of income tax (expense) of ($33) and $0 for the six months ended June 30, 2016 and 2015, respectively	(21)	0	54	0
Other comprehensive income (loss), net of tax	47	(24)	21	45
Comprehensive loss	$ (11,478)	$ (11,053)	$ (23,549)	$ (18,431)