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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Aggregate Fair Value and Carrying Value of Short and Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Short-term debt - related party | $ 1,000 |
Long-term debt - related party | 1,200 | $ 1,295
Long-term debt | 1,558 | 1,295
Total long-term debt | 3,758 | 2,590
Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Short-term debt - related party | 1,000 |
Long-term debt - related party | 1,200 | 1,295
Long-term debt | 1,558 | 1,295
Total long-term debt | $ 3,758 | $ 2,590

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