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CONDENSED 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
Statement of Comprehensive Income [Abstract]        
Net loss $ (14,073) $ (12,891) $ (30,105) $ (36,461)
Other comprehensive (loss) income, net of tax        
Foreign currency translation adjustment, net of income tax benefit of $0 for both of the three months ended September 30, 2017 and 2016, and net of income tax benefit of $2 and $21 for the nine months ended September 30, 2017 and 2016, respectively (82) (4) (168) (37)
Unrealized (loss) gain on available-for-sale securities, net of income tax benefit of $0 and $5 for the three months ended September 30, 2017 and 2016, respectively, and net of income tax (expense) of ($2) and ($28) for the nine months ended September 30, 2017 and 2016, respectively (7) (8) (7) 46
Other comprehensive (loss) income, net of tax (89) (12) (175) 9
Comprehensive loss $ (14,162) $ (12,903) $ (30,280) $ (36,452)