Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at beginning of year	43,298
Shares Granted	30,000
Shares Exercised
Shares expired
Shares cancelled or forfeited	(3,604)
Shares, Outstanding at end of year	69,694
Shares, Expected to vest	37,000
Shares, Exercisable at end of period	32,694
Weighted Average Exercise Price, Beginning Balance	$ 24.87
Weighted Average Exercise Price, Granted	$ 1.35
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Expired
Weighted Average Exercise Price, Cancelled or Forfeited	$ 6.09
Weighted Average Exercise Price, Ending Balance	$ 15.71
Weighted Average Exercise Price, Expected to Vest	$ 1.87
Weighted Average Exercise Price, Exercisable at end of period	$ 31.38
Outstanding at end of period	7 years 4 months 24 days
Expected to vest	9 years 7 months 6 days
Exercisable at end of period	4 years 9 months 18 days
Intrinsic value, Outstanding at end of year
Intrinsic value, Expected to vest
Intrinsic Value Exercisable at end of period