Stock Based Compensation - Option Plan (Details) - Stock Options - Option Plan - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Stock based compensation
Compensation expense	$ 0	$ 0
Number of shares
Shares outstanding	0		0
Exercisable (in shares)			6,600

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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

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