v2.4.0.6
Summary of Significant Accounting Policies (Schedule of Computing Basic and Diluted Net (Loss) Income Per Common Share) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Accounting Policies [Abstract]        
Net loss $ (3,118) $ (3,938) $ (10,176) $ (12,501)
Net income per share - common stock: Basic (in dollars per share) $ (0.09) $ (0.12) $ (0.31) $ (0.39)
Net income per share - common stock: Diluted (in dollars per share) $ (0.09) $ (0.12) $ (0.31) $ (0.39)
Weighted-average shares outstanding-common stock, basic and dilutive (in shares) 33,470,628 32,492,939 33,120,233 31,996,867