SHARE-BASED COMPENSATION, STOCK OPTIONS, AND RESTRICTED SECURITIES, SHARE-BASED COMPENSATION (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock options
Stock-based compensation (in dollars)	$ 215	$ 268
Expected term	10 years
Vesting period	48 months
Cumulative Adjustment on adoption of ASU 2016-09.	$ 19,186	5,583	$ 16,111
Research and development
Stock options
Stock-based compensation (in dollars)	40	94
General and administrative
Stock options
Stock-based compensation (in dollars)	175	174
Stock Options
Stock options
Stock-based compensation (in dollars)	$ 117	$ 165

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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