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Stockholders' Equity - Summary of Non-vested Options (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-vested Options, Number of Options [Roll Forward]      
Non-vested, beginning of period (in shares) [1] 0 0  
Granted (in shares) 0 [1]   0
Vested (in shares) [1] 0 0  
Forfeited (in shares) [1] 0 0  
Non-vested, end of period (in shares) [1] 0 0 0
Non-vested Options, Weighted Average Exercise Price [Roll Forward]      
Non-vested, beginning of period (in dollars per share) [1] $ 0 $ 0  
Granted (in dollars per share) [1] 0    
Vested (in dollars per share) [1] 0 0  
Forfeited (in dollars per share) [1] 0 0  
Non-vested, end of period (in dollars per share) [1] $ 0 $ 0 $ 0
[1] Due to the May 2, 2018 1-for-500 reverse stock split, and no fractional shares being issued, all numbers are reduced to zero.