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Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | $ (655)
Balance | $ 5,140 | 4,448
Increase in current year tax positions | 320 |
Balance | 4,359 | 5,140
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 291
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | (619)
Balance | 4,903 | 4,227
Increase in current year tax positions | 320 |
Balance | 4,074 | 4,903
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 291
Interest and Penalties |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | (36)
Balance | 237 | 221
Increase in current year tax positions | 0 |
Balance | $ 285 | 237
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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