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(Loss) Earnings and Dividends per Share - Computational Components of Basic and Diluted (Loss) Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Basic net income and earnings per share, Numerator (Income) $ (1,461) $ 3,268 $ 3,790 $ 7,798
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income)            
Subordinated convertible promissory notes, Numerator (Income)   82   250
Diluted earnings and earnings per share, Numerator (Income) $ (1,461) $ 3,350 $ 3,790 $ 8,048
Basic net income and earnings per share, Denominator (Shares) 19,965,010 14,630,264 18,275,085 14,591,325
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares)   371,000 607,000 290,000
Subordinated convertible promissory notes, Denominator (shares)   2,257,000   2,318,000
Diluted earnings and earnings per share, Denominator (Shares) 19,965,010 17,258,552 18,881,927 17,199,337
Basic net income and earnings per share, Per Share Amount $ (0.07) $ 0.22 $ 0.21 $ 0.53
Common stock equivalents arising from stock options and employee stock purchase plan, Per share amount     $ (0.01)  
Subordinated convertible promissory notes, Per Share Amount   $ (0.03)   $ (0.06)
Diluted earnings and earnings per share, Per Share Amount $ (0.07) $ 0.19 $ 0.20 $ 0.47