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Description of Operations and Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | [1]
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Accounting Pronouncement Adopted by the Company |  |  |
Operating lease right-of-use asset | $ 1,348 |  | $ 0
Operating lease liability | $ 1,474 |  |
ASU 2016-02, Leases | Adjustment |  |  |
Accounting Pronouncement Adopted by the Company |  |  |
Operating lease right-of-use asset |  | $ 1,500 |
Operating lease liability |  | $ 1,600 |
[1] | Condensed consolidated balance sheet as of December 31, 2018 has been derived from audited consolidated financial statements.

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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