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Stockholders' Equity - Stock Option Activity Schedule (Detail) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Number of Options    
Outstanding, Beginning of year (in shares) 641  
Issued (in shares) 1,105  
Forfeited / canceled (in shares) (3)  
Outstanding, End of year (in shares) 1,743 641
Exercisable, end of year (in shares) 683  
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 17.77  
Issued (USD per share) 21.49  
Forfeited / canceled (USD per share) 15.15  
Outstanding, end of year (USD per share) 20.13 $ 17.77
Options exercises in period, weighted average exercise price (USD per share) $ 18.64  
Weighted-Average Remaining Contractual Term in Years    
Outstanding, weighted average remaining contractual term 6 years 2 months 4 years 11 months
Options exercisable, weighted average remaining contractual term 4 years 9 months  
Aggregate Intrinsic Value    
Outstanding at January 1 $ 2,500  
Outstanding at December 31 0 $ 2,500
Exercisable at year end $ 0  
Employee Stock Option    
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 8.36 $ 5.91
Outstanding, end of year (USD per share) $ 3.79 $ 8.36