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Equity - Equity Incentive Plan (Details) - USD ($)			3 Months Ended		6 Months Ended
	May 18, 2020	Apr. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based compensation
Warrants and Rights Remaining Term					1 year
Warrants Intrinsic Value Outstanding			$ 1,600,000		$ 1,600,000
Inducement Stock Options [Member]
Share-based compensation
Allocated Share-based Compensation Expense			13,000	$ 26,000	26,000	$ 85,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 39,000		$ 39,000
Contractual life					10 years
Inducement Stock Options [Member] | Minimum [Member]
Share-based compensation
Exercise price (in dollars per share)					$ 1.16
Equity Incentive Plan [Member]
Share-based compensation
Number of common stock reserved for issuance			4,005,714		4,005,714
Maximum increase in available number of authorized shares as a percentage of new shares issued					15.00%
Reserved but unissued shares under the Plan, end of period (in shares)			444,161		444,161
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number			2,320,583		2,320,583		1,461,073
Allocated Share-based Compensation Expense			$ 48,000	$ 115,000	$ 115,000	$ 289,000
Shares Reserved Unissued			738,091		738,091
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 180,000		$ 180,000
Stock options awards for directors	79,500	94,500
Exercise price (in dollars per share)	$ 0.54	$ 0.72
Contractual life	10 years
Equity Incentive Plan [Member] | Inducement Stock Options [Member]
Share-based compensation
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan			2,675,744		2,675,744		2,131,058
Board of Directors [Member] | Equity Incentive Plan [Member]
Share-based compensation
Share based compensation grants			34,000	87,000	69,000	69,000

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