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Pledged assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Pledged Assets [Abstract]      
Short-term borrowings [1] $ 164,000 $ 147,000 $ 138,000
For government grants [1] 326 0 200
For customs duties and government grants [1] 130 470 124
Restricted cash and cash equivalents $ 164,326 $ 147,000 $ 138,200
[1] The pledged assets are booked as restricted deposits and classified as current or noncurrent by its liquidity.