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Stock-Based Compensation, Stock-Based Compensation by Type of Award (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation [Abstract]
Stock-based compensation expense	$ 3,711	$ 4,055
General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense	3,711	4,055
Stock Options [Member]
Compensation cost not yet recognized [Abstract]
Unrecognized stock-based compensation expense expected to be recognized related to non-vested stock options	$ 4,801
Weighted-average period for recognition of unrecognized stock-based compensation expense	2 years 1 month 17 days
Stock Options [Member] | General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense	$ 2,756	2,926
RSUs [Member]
Compensation cost not yet recognized [Abstract]
Unrecognized stock-based compensation expense expected to be recognized related to non-vested RSUs	$ 1,882
Weighted-average period for recognition of unrecognized stock-based compensation expense	2 years 3 months 29 days
RSUs [Member] | General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense	$ 955	$ 1,129

X

- Definition

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

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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