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Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Tax Credit Carryforward [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions |  | $ (254)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | $ (1,101) |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | 655
Tax Credit Carryforward, Amount | 11,752 | 8,369
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties |  |
Tax Credit Carryforward [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions |  | (234)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | (1,149) |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | 619
Interest and Penalties |  |
Tax Credit Carryforward [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions |  | (20)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | $ (48) |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | $ 36

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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- Definition Amount of decrease 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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