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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment

5.

Property and equipment

Property and equipment consist of the following:

 

 

 

As of December 31,

 

 

 

2016

 

 

2017

 

 

 

$

 

 

$

 

Office equipment

 

 

49,432

 

 

 

273,339

 

Electronic equipment

 

 

66,271

 

 

 

160,772

 

Vehicle

 

 

76,636

 

 

 

81,360

 

Laboratory equipment

 

 

593,582

 

 

 

1,686,133

 

Manufacturing equipment

 

 

—

 

 

 

2,832,726

 

Leasehold improvements

 

 

465,428

 

 

 

3,227,150

 

Construction in progress

 

 

252,509

 

 

 

4,252,894

 

 

 

 

1,503,858

 

 

 

12,514,374

 

Less: accumulated depreciation

 

 

(257,800

)

 

 

(660,610

)

Property and equipment, net

 

 

1,246,058

 

 

 

11,853,764

 

 

Depreciation expenses for the years ended December 31, 2015, 2016 and 2017 were $125,774, $198,224 and $545,705, respectively.