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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