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Nature of Operations and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 State
Equity [Line Items] |  |  |
Number of states | State |  |  | 16
Number of common stock, shares issued | shares |  | 584,000 |
Total consideration for issuance of common stock |  | $ 10,000 |
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member] |  |  |
Equity [Line Items] |  |  |
Number of common stock, shares issued | shares | 583,771 |  |
Common stock, price per share | $ / shares | $ 17.13 |  |
Total consideration for issuance of common stock | $ 10,000 |  |
Represents the non-cash portion for cancellation of outstanding indebtedness, including accrued interest | 7,035 |  |
Cash proceeds from private placement | $ 2,965 |  |

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