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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Value added tax recoverable $ 328 $ 118
Rental and utility deposit 19 15
Advance to suppliers 410 123
Prepayment 654 403
Coupon and dividend receivable 93 140
Others 915 859
Total prepaid expenses and other current assets $ 2,419 $ 1,658