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Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2019
Accounting Standards Update 2016-02 |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Office lease liabilities |  |  | $ 4.8
Office lease right-of-use assets |  |  | $ 4.8
Pro Forma | Accounting Standards Update 2018-11 |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Operating lease, expense | $ 1.8 | $ 3.4 |

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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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