Annual report pursuant to Section 13 and 15(d)

Stock Option Plans (Summary of Stock Option Activity) (Detail)

v3.3.1.900
Stock Option Plans (Summary of Stock Option Activity) (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of shares outstanding      
Outstanding, Ending Balance 1,022,789    
Employee Stock Option [Member]      
Number of shares outstanding      
Outstanding, Beginning Balance 720,551 214,518  
Granted 374,000 548,000  
Exercised (15,833) (10,819)  
Expired or Forfeited (55,929) (31,148)  
Outstanding, Ending Balance 1,022,789 720,551 214,518
Weighted Average Exercise Price      
Outstanding, Beginning Balance $ 4.46 $ 9.72  
Granted 5.67 2.63  
Exercised 2.60 1.71  
Expired or Forfeited 8.12 2.71  
Outstanding, Ending Balance $ 4.59 $ 4.46 $ 9.72
Weighted Average Remaining Life (Years)      
Options Outstanding, Weighted Average Remaining Life (Years) 7 years 6 months 22 days 8 years 6 months 22 days 6 years 1 month 10 days