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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of shares available for grant (in shares) 1,190,426    
Compensation not yet recognized $ 2,432    
Period for recognition (in years) 1 year 8 months    
Vesting period (in years) 10 years    
Requisite service period (in years) 4 years    
Weighted-average fair value of options granted during the year (in dollars per share) $ 1.54 $ 2.20 $ 1.79
Proceeds from stock options exercised $ 0 $ 297 $ 811
Total intrinsic value $ 0 $ 103 520
Vested (in shares) 351,938 266,091  
Vested (in dollars per share) $ 1,821 $ 1,553  
Total stock-based compensation expense $ 1,809 2,322 1,798
Share Price (in dollars per share) $ 1.89    
Second Anniversary of Award Date      
Percent of options vesting 50.00%    
Third Anniversary of Award Date      
Percent of options vesting 25.00%    
Fourth Anniversary of Award Date      
Percent of options vesting 25.00%    
Minimum      
Vesting period (in years) 2 years    
Maximum      
Vesting period (in years) 4 years    
Non-Vested Stock Options      
Compensation not yet recognized $ 0    
Weighted-average fair value of options granted during the year (in dollars per share) $ 1.54    
The First Type of Restriced Stock Units      
Vesting period (in years) 3 years    
The Second Type of Restricted Stock Units      
Vesting period (in years) 2 years    
The Second Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of options vesting 67.00%    
The Second Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of options vesting 33.00%    
The Third Type of Restricted Stock Units      
Vesting period (in years) 2 years    
The Third Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of options vesting 67.00%    
The Third Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of options vesting 33.00%    
Restricted Stock Units (RSUs)      
Compensation not yet recognized $ 2,432    
Period for recognition (in years) 1 year 8 months    
Total stock-based compensation expense $ 1,615 2,086 2,043
Deferred directors fees      
Total stock-based compensation expense $ 0 $ 0 $ 0
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards      
Number of shares reserved for future issuance 4,400,676