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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

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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