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Summary of Significant Accounting Policies - New Accounting Pronouncements - Share-Based Payments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Adoption of new accounting pronouncements |  |  |
Decrease in cash flow from financing activities |  |  | $ (318)
ASU 2016-09 |  |  |
Adoption of new accounting pronouncements |  |  |
Increase in provision for income taxes | $ (46) | $ (169) |
ASU 2016-09 | Adjustment |  |  |
Adoption of new accounting pronouncements |  |  |
Increase in provision for income taxes |  | 169 |
Decrease in cash flow from operating activities |  | 169 |
Decrease in cash flow from financing activities |  | $ 169 |

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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