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Leases - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2020 ft² | Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Right-of-use asset obtained in exchange for operating lease liability | $ 300 |  |  |  |
Operating leases, rent expense |  | $ 3,600 | $ 3,600 |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment for adoption of ASU |  |  |  |  | $ 531
Accounting Standards Update 2016-02 | Retained Earnings |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment for adoption of ASU |  |  |  |  | $ 531
Israel | Forecast |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Area of land (in sq ft) | ft² |  |  |  | 121,400 |
Buildings and Vehicles | Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, remaining lease term (years) | 1 year |  |  |  |
Buildings and Vehicles | Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lessee, operating lease, remaining lease term (years) | 7 years |  |  |  |

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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