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Equity - Stock Options - Valuation assumptions (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation
Granted (in shares)		743,161	1,328,718
Exercise price (in dollars per share)		$ 1.07	$ 1.32
Expected life		10 years	5 years 9 months
Weighted average volatility		83.00%	71.00%
Forfeiture rate		0.00%	20.00%
Weighted average risk-free interest rate		0.71%	2.52%
Expected dividend rate		0.00%	0.00%
Fair value of options granted (in dollars)		$ 549,000	$ 664,000
Minimum [Member]
Share-based compensation
Vesting period		1 year
Maximum [Member]
Share-based compensation
Vesting period		3 years
Stock Options [Member]
Share-based compensation
Granted (in shares)		743,161	1,328,718
Stock Issued During Period In Lieu of Cash Bonus		444,161	159,100
Options covering an additional (in shares)		299,000
Contractual life		10 years
Stock Options [Member] | Minimum [Member]
Share-based compensation
Exercise price (in dollars per share)		$ 0.54	$ 0.87
Stock Options [Member] | Maximum [Member]
Share-based compensation
Exercise price (in dollars per share)		$ 2.38	$ 1.21
Stock Options [Member] | Chief Executive Officer [Member]
Share-based compensation
Granted (in shares)		258,618
Compensation expense		$ 192,000
Purchase of common stock	80,000
Stock Options [Member] | Chief Executive Officer [Member] | Non-vested stock options
Share-based compensation
Granted (in shares)		600,000
Stock Options [Member] | Director [Member]
Share-based compensation
Estimated common stock subject to options issued			381,000
Stock Options [Member] | Other Employees [Member]
Share-based compensation
Granted (in shares)		530,000

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The options covering an additional shares.

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The Forfeiture rate assumption that is used in valuing an option on its own shares.

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Fair value of options granted in period. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of stock (or other type of equity) issued during the period as a result of in lieu of cash bonus.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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