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SIGNIFICANT ACCOUNTING POLICIES - Stock-based compensation expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Stock-based compensation expense	$ 1,031,000	$ 1,041,000	$ 2,149,000	$ 2,186,000
Options
Stock-based compensation expense	39,000	103,000	116,000	210,000
Outstanding unamortized share-based compensation expense	58,000		58,000
Restricted stock units
Stock-based compensation expense	900,000	889,000	1,887,000	1,877,000
Outstanding unamortized share-based compensation expense	5,990,000		5,990,000
Unrestricted Shares of Common Stock
Stock-based compensation expense	86,000	$ 49,000	140,000	$ 99,000
Employee stock purchase plan
Stock-based compensation expense	$ 6,000		$ 6,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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