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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Chief Executive Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Term of loan | 1 year |  |  |
Percentage of loan | 0.00% |  |  |
Loan amount included as compensation to the Chief Executive Officer | $ 61 |  |  |
Series A Investor | Management and Administrative Support Services |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Reimbursed out-of-pocket and other expenses |  | $ 39 | $ 42 | $ 27

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