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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

SUMMARY OF PRINCIPAL ACCOUNTING POLICIES

Schedule of Property, Plant and Equipment, Depreciation, Estimated Lives

Property, plant and equipment are recorded at cost less accumulated depreciation. Depreciation is recognized on a straight-line basis over the following estimated useful lives:

​

​	​	​	​
Buildings and plant		30	years
Machinery and equipment		15	years
Furniture, fixtures and equipment		3-5	years
Motor vehicles		6	years

Schedule of Share-Based Compensation Expenses

​

​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2018			2019			2020
Selling, general and administrative expenses	​	$	12,462	​	$	15,463	​	$	15,929
Cost of revenues	​		1,326	​		2,084	​		1,857
Research and development expenses	​		—	​		350	​		122
Total	​	$	13,788	​	$	17,897	​	$	17,908

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- Definition

Tabular disclosure of the estimated useful lives of property and equipment.

+ References

No definition available.

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- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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