INVESTMENT SECURITIES - Summary of investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized cost, as adjusted	$ 87,848	$ 51,409
Gross unrealized holding losses	1,748	164
Estimated fair value	86,100	51,245
Short-term Investments [Member] \| Obligations of domestic governmental agencies [Member]
Amortized cost, as adjusted	66,082	15,876
Gross unrealized holding losses	924	4
Estimated fair value	65,158	15,872
Long-term investments [Member] \| Obligations of domestic governmental agencies [Member]
Amortized cost, as adjusted	21,766	35,533
Gross unrealized holding losses	824	160
Estimated fair value	$ 20,942	$ 35,373

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant