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BALANCE SHEET DETAILS - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid and other current assets    
Prepaid tax $ 3,468 $ 3,927
Advance to suppliers 982 6,542
Other receivable 794 983
Prepaid others 1,532 2,775
Total Prepaid and other current assets $ 6,776 $ 14,227