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Summary of Significant Accounting Policies - Forward Contracts and Related Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Notional amount | $ 38,887 | $ 6,746
Fair value of asset (liability) | $ 120 | $ (32)

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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