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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Gross carrying amount | $ 6,270,000 | $ 6,700,000 |  | $ 0
Right of use lease obligations | 6,270,000 | $ 6,700,000 |  |
Intangible Assets, Net (Excluding Goodwill) | $ 68,000 |  | $ 102,000 |

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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