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BALANCE SHEET DETAILS - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid and other current assets    
Prepaid tax $ 3,927 $ 3,468
Advance to suppliers 6,542 53
Other receivable 983 811
Prepaid others 2,775 2,663
Total Prepaid and other current assets $ 14,227 $ 6,995