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Equity - Inducement Stock Options (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Granted (in shares)	1,328,718	224,000
Exercise price (in dollars per share)	$ 1.32	$ 1.94
Expected life	5 years 9 months	6 years 2 months 12 days
Weighted average volatility	71.00%	70.00%
Forfeiture rate	20.00%	15.00%
Weighted average risk-free interest rate	2.52%	2.74%
Expected dividend rate	0.00%	0.00%
Minimum [Member]
Vesting period	1 year
Maximum [Member]
Vesting period	3 years
Inducement Stock Options [Member]
Granted (in shares)	176,000
Contractual life	10 years
Vesting period	2 years
Compensation expense	$ 111,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 65,000
Expected life	5 years 9 months
Weighted average volatility	71.00%
Forfeiture rate	20.00%
Weighted average risk-free interest rate	2.55%
Expected dividend rate	0.00%
Inducement Stock Options [Member] | Minimum [Member]
Exercise price (in dollars per share)	$ 1.16
Inducement Stock Options [Member] | Maximum [Member]
Exercise price (in dollars per share)	$ 2.25
Inducement Stock Options [Member] | Chief Executive Officer [Member]
Granted (in shares)	600,000
Inducement Stock Options [Member] | 2011 Equity Incentive Plan [Member]
Granted (in shares)	258,618
Inducement Stock Options [Member] | Non-Qualified Stock Option [Member]
Granted (in shares)	341,382

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- Definition

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

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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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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Gross number of share options (or share units) granted during the period.

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