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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |  |  |
Cash associated with indefinitely reinvested foreign earnings | $ 4,900 |  |  |
Unrecognized tax benefits related to uncertain tax positions | 9,127 | $ 9,105 | $ 6,844 | $ 7,671
Recorded as a decrease in deferred tax assets and offsetting valuation allowance | 8,451 | 7,996 | 5,382 |
Unrecognized Tax Benefits Recorded as Other Long Term Liability | 676 | 1,109 | 1,462 |
Reversal of tax reserve | 543 | $ 511 | $ 903 |
Interest and penalty expense recognized related to unrecognized tax benefits | 300 |  |  |
Unrecognized tax benefits | 700 |  |  |
Tax Reserve Member |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Reversal of tax reserve | 300 |  |  |
Unrecognized Tax Benefits Reserve Accrued Interest Member |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Reversal of tax reserve | 200 |  |  |
Research and development and other tax credit carryforwards |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards | $ 22,700 |  |  |

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- Definition Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6487024&loc=d3e29054-158556 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 995 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6503627&loc=d3e59836-110443 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28200-109314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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