CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (12,891)	$ (14,630)	$ (36,461)	$ (33,106)
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustment, net of income tax (expense) of $0 and ($40) for the three months ended September 30, 2016 and 2015, respectively, and net of income tax benefit (expense) of $21 and ($84) for the nine months ended September 30, 2016 and 2015, respectively	(4)	59	(37)	104
Unrealized (loss) gain on available-for-sale securities, net of income tax benefit of $5 and $0 for the three months ended September 30, 2016 and 2015, respectively, and net of income tax (expense) of ($28) and $0 for the nine months ended September 30, 2016 and 2015, respectively	(8)	4	46	4
Other comprehensive (loss) income, net of tax	(12)	63	9	108
Comprehensive loss	$ (12,903)	$ (14,567)	$ (36,452)	$ (32,998)