Property, plant and equipment, net (Tables)

3 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment consist of the following:

	March 31, 2019			December 31, 2018
	US$			US$
Machinery, equipment and furniture		587,775,600			580,735,482
Motor vehicles		2,810,727			2,658,487
Workshops and buildings		160,475,642			157,976,839
Construction in progress		220,310,743			217,194,285
Total property, plant and equipment		971,372,712			958,565,093
Less accumulated depreciation		(200,959,201	)		(182,623,813	)
Property, plant and equipment, net		770,413,511			775,941,280

Schedule of the Allocation of Depreciation Expense on Property, Plant and Equipment

For the three-month periods ended March 31, 2019 and 2018, the Company capitalized US$387,324 and US$643,788 of interest costs as a component of the cost of construction in progress. Depreciation expense on property, plant and equipment was allocated to the following expense items:

	Three-Month Period Ended March 31,
	2019		2018
	US$		US$
Cost of revenues		13,458,983		9,568,618
Selling expenses		1,823		1,430
General and administrative expenses		686,523		794,625
Research and development expenses		1,022,123		911,640
Total depreciation expense		15,169,452		11,276,313