Prepayments, Deposits and Other Assets, net (Tables)

12 Months Ended

Dec. 31, 2021

Prepayments Deposits And Other Assets Net [Abstract]

Schedule of prepayments, deposits and other assets, net

	As of December 31,
	2021			2020
Security deposits (1)	$	381,813		$	385,607
Advances to suppliers		1,483,084			1,508,022
Advances to employees		317,725			215,735
Prepaid expense		360,074			293,573
Others		188,216			288,464
		2,730,912			2,691,401
Less: Long term portion		(381,656	)		(385,607	)
Allowance for doubtful accounts		(313,844	)		(306,513	)
Prepayments, deposits and other assets – current portion	$	2,035,412		$	1,999,281

(1) Security deposits mainly represent contract fulfillment deposits required by customer for specific projects, rent deposits and etc.

Schedule of allowance for doubtful accounts

	As of December 31,
	2021			2020		2019
Beginning balance	$	306,513		$	31,139	$	14,047
Provision(recovery) for doubtful accounts		88,846			258,280		17,400
Write off		(88,846	)		-		-
Foreign currency translation adjustments		7,331			17,094		(308	)
Ending balance	$	313,844		$	306,513	$	31,139