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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Foreign currency translation adjustment, tax (expense) benefit $ 0 $ 2
Unrealized gain on available-for-sale securities, tax benefit (expense) $ 0 $ (2)