BUSINESS SEGMENTS AND MAJOR CUSTOMERS - Summary of revenue by product group (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
BUSINESS SEGMENTS AND MAJOR CUSTOMERS
Total revenue	$ 12,204	$ 16,131
Operating Segments \| Biometrics
BUSINESS SEGMENTS AND MAJOR CUSTOMERS
Total revenue	11,170	15,042
Operating Segments \| Imaging
BUSINESS SEGMENTS AND MAJOR CUSTOMERS
Total revenue	$ 1,034	$ 1,089

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration