Accounts receivable (Tables)

3 Months Ended

Mar. 31, 2019

Accounts Receivable, after Allowance for Credit Loss [Abstract]

Schedule of Accounts Receivable

Accounts receivable consists of the following:

	March 31, 2019			December 31, 2018
	US$			US$
Accounts receivable		154,090,385			294,726,804
Allowance for doubtful accounts		(39,258	)		(38,516	)
Accounts receivable, net		154,051,127			294,688,288

Schedule of Aging of Accounts Receivable

The following table provides an analysis of the aging of accounts receivable as of March 31, 2019 and December 31, 2018:

	March 31, 2019		December 31, 2018
	US$		US$
Aging:
– current		95,781,698		218,458,862
– 1-3 months past due		15,305,123		31,386,341
– 4-6 months past due		89,204		109,412
– 7-12 months past due		10,746,881		42,532,170
– greater than one year past due		32,167,479		2,240,019
Total accounts receivable		154,090,385		294,726,804