Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2019

Significant Accounting Policies [Line Items]

Summary of Estimated Useful Lives of Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets as follows:

	Useful life
Office equipment	3 years
Electronic equipment	3 years
Vehicle	4 years
Laboratory equipment	5 years
Manufacturing equipment	10 years
Leasehold improvements	lesser of useful life or lease term

Suppliers Accounted for 10% or More of Research and Development Expenses

The following suppliers accounted for 10% or more of research and development expenses for the nine months ended September 30, 2018 and 2019:

	For the nine months ended September 30,
	2018		2019
	$		$
A		14,879,238	*
B		10,769,334	*
C	*			28,136,372
D	*			18,474,269

ASU 2016-02

Significant Accounting Policies [Line Items]

Schedule of Impact on Unaudited Condensed Consolidated Balance Sheet Upon Adoption of ASU 2016-02

The impact on the unaudited condensed consolidated balance sheet upon adoption of ASU 2016-02 was as follows:

	As of		Effect of			As of
	December 31,		the option of			January 1,
	2018		ASU 2016-02			2019
	As reported					As adjusted
	$		$			$
Assets:
Prepayments and other current assets		5,749,260		(138,740	)		5,610,520
Operating lease right-of-use assets		—		7,093,473			7,093,473
Liabilities:
Current operating lease liabilities		—		(2,286,889	)		(2,286,889	)
Non-current operating lease liabilities		—		(4,667,844	)		(4,667,844	)