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Commitments, Rights of Use and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |
Increase in right-of-use assets obtained in exchange for lease obligations | $ 15,733 | $ 1,062 | $ 0 | $ 18,335 | $ 0 | $ 0
Lease and rental payments |  |  |  | 3,799 |  |
Operating lease and other contractual commitments |  | 1,491 |  | 1,491 |  | 1,299
Pledged bank deposits |  | $ 1,325 |  | $ 1,325 |  | $ 1,143

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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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