SEGMENT INFORMATION (Details) $ in Thousands	6 Months Ended
Jun. 30, 2026 USD ($) segment	Dec. 31, 2025 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	1
Number of operating segments \| segment	1
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 409,307	$ 340,081
Mainland China
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	389,842	321,748
South Korea
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	6,783	8,868
United States
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 12,682	$ 9,465

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration