Stock Option Plans (Summary of Stock Option Activity) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of shares outstanding
Outstanding, Beginning Balance	214,518	192,729
Granted	548,000	45,000
Exercised	(10,819)	0
Expired or Forfeited	(31,148)	(23,211)
Outstanding, Ending Balance	720,551	214,518	192,729
Weighted Average Exercise Price
Outstanding, Beginning Balance	$ 9.72	$ 10.68
Granted	$ 2.63	$ 2.00
Exercised	$ 1.71	$ 0
Expired or Forfeited	$ 2.71	$ 2.71
Outstanding, Ending Balance	$ 4.46	$ 9.72	$ 10.68
Weighted Average Remaining Life (Years)
Options Outstanding, Weighted Average Remaining Life (Years)	8 years 6 months 22 days	6 years 1 month 10 days	4 years 6 months 7 days