Property and Equipment, net

12 Months Ended

Dec. 31, 2018

Property Plant And Equipment [Abstract]

Property and Equipment, net

7. Property and equipment, net

Property and equipment consist of the following:

	As of December 31,
	2017			2018
	$			$
Office equipment		273,339			384,088
Electronic equipment		160,772			599,495
Vehicle		81,360			77,460
Laboratory equipment		1,686,133			3,916,615
Manufacturing equipment		2,832,726			9,368,930
Leasehold improvements		3,227,150			4,607,975
Construction in progress		4,252,894			3,747,838
		12,514,374			22,702,401
Less: accumulated depreciation		(660,610	)		(2,207,919	)
Property and equipment, net		11,853,764			20,494,482

Depreciation expenses for the years ended December 31, 2016, 2017 and 2018 were $198,224, $545,705 and $1,634,377, respectively.