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Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Jan. 01, 2019
Leases |  |  |  |
Operating lease liability |  |  | $ 3,916 |
ASU 2016-02 |  |  |  |
Leases |  |  |  |
Right-of-use assets |  |  |  | $ 4,800
Operating lease liability |  |  |  | $ 4,800
Pro Forma | ASU 2016-02 |  |  |  |
Leases |  |  |  |
Operating lease, expense | $ 8,000 | $ 3,600 |  |

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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