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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Accounting Policies [Abstract] |  |
Fair value assets transferred from level 1 to level 2 | $ 0 | $ 0
Fair value assets transferred from level 2 to level 1 | 0 | 0
Fair value liabilities transferred from level 1 to level 2 | 0 | 0
Fair value liabilities transferred from level 2 to level 1 | 0 | 0
Fair value measurement with unobservable inputs reconciliation recurring basis asset transfers net | 0 | 0
Fair value measurement with unobservable inputs reconciliation recurring basis liabilities transfers net | $ 0 | $ 0

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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