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Long-Term Debt - Tremont Promissory Note Payable - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2018 | Mar. 31, 2018
Promissory Note | Tremont |  |
Debt Instrument [Line Items] |  |
Principal prepayments of note | $ 2.2 | $ 2.2

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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Details
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