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Stock-Based Compensation, Stock-Based Compensation by Type of Award (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation [Abstract] |  |  |
Stock-based compensation expense | $ 4,055 | $ 3,986 | $ 5,398
General and Administrative Expense [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Stock-based compensation expense | 4,055 | 3,986 | 5,398
Stock Options [Member] |  |  |
Compensation cost not yet recognized [Abstract] |  |  |
Unrecognized stock-based compensation expense expected to be recognized related to non-vested stock options | $ 5,960 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 2 years 8 months 1 day |  |
Stock Options [Member] | General and Administrative Expense [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Stock-based compensation expense | $ 2,926 | 2,446 | 3,436
RSUs [Member] |  |  |
Compensation cost not yet recognized [Abstract] |  |  |
Unrecognized stock-based compensation expense expected to be recognized related to non-vested RSUs | $ 1,442 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 2 years 4 months 17 days |  |
RSUs [Member] | General and Administrative Expense [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Stock-based compensation expense | $ 1,129 | $ 1,540 | $ 1,962

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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=109197908&loc=d3e5070-113901 + Details
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