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Prepaid expenses and other current assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Valued-added tax recoverable $ 1,013 $ 1,028
Prepaid expenses 906 832
Advance to suppliers 324 352
Grants recoverable 71 430
Total Prepaid expenses and other current assets $ 2,314 $ 2,642