Average Share Information - Reconciliation of Denominators of Basic and Diluted Net Loss Per Common Share Computations for Periods Indicated (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Line Items]
Weighted average common shares outstanding - basic	12,640,517	12,618,092	12,638,838	12,533,937
Dilutive impact resulting from potential common share issuances
Weighted average common shares outstanding - diluted	12,640,517	12,618,092	12,638,838	12,533,937
Per Share Data
Net income (loss) - basic	$ 0.25	$ (0.43)	$ (0.36)	$ (1.68)
Net income (loss) - diluted	$ 0.25	$ (0.43)	$ (0.36)	$ (1.68)