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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. 28, 2016 USD ($) $ / shares shares | Apr. 30, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) State
Equity [Line Items] |  |  |
Number of states | State |  |  | 14
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 | $ 17.13 |
Issuance of common stock | $ 10,000 | $ 10,000 |
Proceeds used to cancellation of outstanding indebtedness | 7,035 | 7,035 |
Cash proceeds from private placement | $ 2,965 | $ 2,965 |

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