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Stockholders' Equity - Stock Option Activity Schedule (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Options    
Outstanding, Beginning of year (in shares) 1,979  
Issued (in shares) 252  
Outstanding, End of year (in shares) 2,231 1,979
Exercisable, end of year (in shares) 1,440  
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 19.52  
Issued (USD per share) 17.34  
Outstanding, end of year (USD per share) 19.27 $ 19.52
Exercisable, weighted average exercise price (USD per share) $ 19.66  
Weighted-Average Remaining Contractual Term in Years    
Outstanding, weighted average remaining contractual term 4 years 9 months 7 days 5 years 5 months 15 days
Options exercisable, weighted average remaining contractual term 3 years 9 months 14 days  
Aggregate Intrinsic Value    
Outstanding at January 1 $ 1,431  
Outstanding at December 31 0 $ 1,431
Exercisable at year end $ 0  
Employee Stock Option    
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 5.81 $ 3.79
Outstanding, end of year (USD per share) $ 6.30 $ 5.81