Share-Based Compensation (Details) - Stock Options [Member] - $ / shares	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted-average risk-free interest rates	2.50%	0.50%	2.50%
Weighted-average expected life of the option	7 years	4 years 6 months	7 years
Weighted-average expected stock price volatility	94.00%	94.00%	94.00%
Weighted-average fair value of the options granted	$ 0.67	$ 0.36	$ 0.64

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

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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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