LEASE - Balances reported in the consolidated balance sheets (Details) - Dec. 31, 2019 $ in Thousands, $ in Thousands	USD ($)	HKD ($)
Balances reported in the consolidated balance sheets related to the leases
Operating lease right-of-use assets	$ 20,748	$ 161,617
Operating lease liabilities	$ 22,141	$ 172,466

Present value of lessee's discounted obligation for lease payments from operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant