ORDINARY SHARE AND SHARE INCENTIVE PLANS - Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Unrecognized compensation cost related to unvested stock options and restricted stock and restricted stock units
Unrecognized compensation cost	$ 0.9	$ 1.5
Expected weighted-average period of unrecognized cost	1 year 9 months 18 days	1 year 8 months 8 days

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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 (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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