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Share-Based Payments - Activity of RSUs (Detail) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of shares      
Nonvested restricted common stock, beginning balance 354,058 260,000  
Shares granted 165,777 121,823 260,000
Restricted stock forfeited (310,181) (27,765)  
Nonvested restricted common stock, ending balance 209,654 354,058 260,000
Grant Date Fair Value per Restricted Stock Unit      
Nonvested restricted common stock, beginning balance $ 7.44 $ 7.53  
Shares granted 4.57 7.20 $ 7.53
Restricted stock forfeited 7.20 7.20  
Nonvested restricted common stock, ending balance $ 5.53 $ 7.44 $ 7.53
Directors      
Number of shares      
Shares granted 67,972    
Units converted to common stock (36,649)    
Nonvested restricted common stock, ending balance 31,323    
Grant Date Fair Value per Restricted Stock Unit      
Shares granted $ 3.00    
Units converted to common stock 3.11    
Nonvested restricted common stock, ending balance $ 2.87