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Stockholders' Equity - Stock Option Activity Schedule (Detail) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of Options    
Outstanding, Beginning of year (in shares) 1,743  
Issued (in shares) 239  
Exercised (in shares) 0  
Forfeited / canceled (in shares) (3)  
Outstanding, End of year (in shares) 1,979 1,743
Exercisable, end of year (in shares) 1,094  
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 20.13  
Issued (USD per share) 15.03  
Exercised (USD per share) 0.00  
Forfeited / canceled (USD per share) 15.15  
Outstanding, end of year (USD per share) 19.52 $ 20.13
Exercisable, weighted average exercise price (USD per share) $ 19.51  
Weighted-Average Remaining Contractual Term in Years    
Outstanding, weighted average remaining contractual term 5 years 5 months 15 days 6 years 2 months
Options exercisable, weighted average remaining contractual term 4 years 3 months 18 days  
Aggregate Intrinsic Value    
Outstanding at January 1 $ 0  
Outstanding at December 31 1,431,000 $ 0
Exercisable at year end $ 1,329,000  
Employee Stock Option    
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 3.79 $ 8.36
Outstanding, end of year (USD per share) $ 5.81 $ 3.79