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Basis of Financial Statement Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Jan. 01, 2019
Basis of Financial Statement Presentation |  |  |
Election of practical expedients package | true |  |
Operating lease, ROU asset | $ 1,100 |  |
Operating lease, ROU asset, Statement of Financial Position | us-gaap:PropertyPlantAndEquipmentNet |  |
Operating lease liability | $ 1,124 |  |
Operating lease, liability, Statement of Financial Position | us-gaap:AccruedLiabilitiesAndOtherLiabilities |  |
ASU 2016-02 | Adjustment |  |  |
Basis of Financial Statement Presentation |  |  |
Operating lease, ROU asset |  |  | $ 1,200
Operating lease, ROU asset, Statement of Financial Position |  |  | us-gaap:PropertyPlantAndEquipmentNet
Operating lease liability |  |  | $ 1,200
Operating lease, liability, Statement of Financial Position |  |  | us-gaap:AccruedLiabilitiesAndOtherLiabilities
ASU 2018-02 |  |  |
Basis of Financial Statement Presentation |  |  |
Reclassification from accumulated other comprehensive loss to retained earnings |  | $ 66 |

X
- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=113997351&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=113997351&loc=SL77916155-209984 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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