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Prepayments, Deposits and Other Assets, Net (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Prepayments Deposits And Other Assets Net [Abstract] |  |  |
Advances to suppliers |  | $ 138,464 | $ 310,808
Security deposits | [1] | 857,676 | 624,093
Advances to employees |  | 248,191 | 262,682
Prepaid expense |  | 222,862 | 12,772
Loan to others | [2] | 47,997 | 908,453
Deferred offering cost |  | 400,640 |
Others |  | 109,721 | 100,777
Prepayments, deposits and other assets, net |  | 2,025,551 | 2,219,585
Less: Long term portion |  | (865,498) | (624,093)
Allowance for doubtful accounts |  | (14,047) | (19,422)
Prepayments, deposits and other assets - current portion |  | $ 1,146,006 | $ 1,576,070
[1] | Security deposits represent contract fulfillment deposits required by customer for specific projects, rent deposits and etc.
[2] | The Company had unsecured, non-interest-bearing loan receivables from various vendors. The maturity of these loans are generally within one or two years.

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