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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Operating Lease, ROU assets | $ 19,501 | $ 19,500 |  |
Lease liabilities | $ 23,496 |  |  |
Deferred Rent Credit |  |  |  | $ 4,000
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, ROU assets |  |  | $ 17,000 |
Lease liabilities |  |  | $ 21,000 |

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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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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- Definition Amount of lessee's right to use underlying asset under 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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