Stock Option Plans - Liberty Stock Option Plan (Details) - Stock options - Liberty 2004 Stock Option Plan - USD ($)	9 Months Ended
Sep. 30, 2019	Feb. 28, 2018
Outstanding shares
Shares	8,709
Number of option exercised	0
Number of options forfeited	0
Weighted Average Exercise Price
Average price		$ 4.14
Employees
Outstanding shares
Shares	2,355
Weighted Average Exercise Price
Average price	$ 4.14
Outstanding value
Amount	$ 9,750
Directors
Outstanding shares
Shares	6,354
Weighted Average Exercise Price
Average price	$ 4.14
Outstanding value
Amount	$ 26,306

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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