Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 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 and Inventory Purchases

The following suppliers accounted for 10% or more of research and development expenses and the inventory purchases for the years ended December 31, 2017, 2018 and 2019:

	Year ended December 31,
	2017		2018		2019
	$		$		$
A		7,652	*		*
B		7,104	*		*
C	*			25,515	*
D	*			14,664	*
E	*		*			27,966
F	*		*			18,362

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 consolidated balance sheet upon adoption of ASU 2016-02 was as follows:

	As of December 31, 2018		Effect of the option of ASU 2016-02			As of January 1, 2019
	As reported					As adjusted
	$		$			$
Assets:
Prepayments and other current assets		5,749		(138	)		5,611
Operating lease right-of-use assets		—		7,093			7,093
Liabilities:
Current operating lease liabilities		—		(2,287	)		(2,287	)
Non-current operating lease liabilities		—		(4,668	)		(4,668	)