Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS    
Foreign currency translation adjustments, tax $ 0 $ 0
Foreign currency losses on intercompany loan of a long-term investment nature, tax 0 0
Unrealized holding gains on available-for-sale debt securities, tax 0 0
Reclassification adjustment for losses on available-for-sale debt securities included in net loss, tax $ 0 $ 0