Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of property, plant and equipment are carried at cost less accumulated depreciation

Buildings	20 years
Machineries and equipment	10 years
Fixtures and electronic equipment	4 – 5 years
Motor vehicles	5 years
Leasehold improvements	Shorter of the lease term or estimated useful lives

Schedule of net revenues from customers

	December 31, 2018		December 31, 2019		December 31, 2020
Percentage of revenue contributed by Customer A	16	%	11	%	—
	16	%	11	%	—

Schedule of accounts receivable from customers

	December 31, 2019	December 31, 2020
Percentage of accounts receivable from Customer B	—	10%
	—	10%