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Related-Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Related-party transactions | $ 0 |
Chief Executive Officer |  |
Related Party Transaction [Line Items] |  |
Proceeds from repayment of loan |  | $ 200,000
Interest accrued rate |  | 0.60%

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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Details
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