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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS    
Foreign currency translation adjustments, tax $ 0 $ 0
Unrealized holding losses on available-for-sale debt securities, tax 0 0
Reclassification from accumulated other comprehensive income of losses on available-for-sale debt securities included in net income, tax $ 0 $ 0