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Stock Option Plans (Summary of Stock Option Activity) (Detail) - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Number of shares outstanding  
Outstanding, Beginning Balance 720,551
Granted 254,000
Exercised (15,833)
Expired or Forfeited (34,167)
Outstanding, Ending Balance 924,551
Weighted Average Exercise Price  
Outstanding, Beginning Balance | $ / shares $ 4.46
Granted | $ / shares 5.45
Exercised | $ / shares 2.60
Expired or Forfeited | $ / shares 3.38
Outstanding, Ending Balance | $ / shares $ 4.81