Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share - Summary of Basic and Diluted Earnings Per Share (Detail)

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Net Income (Loss) Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income (loss) $ (4,581) $ 450 $ (2,559) $ (6,562) $ (4,692) $ (11,388) $ (4,796) $ (1,148) $ (13,252) $ (22,024) $ 10,114
Net income allocable to preferred stockholders                     (1,215)
Net income (loss) attributable to common stockholders                 $ (13,252) $ (22,024) $ 8,899
Denominator:                      
Weighted average common shares outstanding-basic                 33,198 32,573 26,743
Dilutive common stock equivalents                     2,735
Weighted average common shares outstanding-diluted                 33,198 32,573 29,478
Net income (loss) per share attributable to common stockholders:                      
Basic $ (0.14) $ 0.01 $ (0.08) $ (0.20) $ (0.14) $ (0.35) $ (0.15) $ (0.04) $ (0.40) [1] $ (0.68) [1] $ 0.33 [1]
Diluted $ (0.14) $ 0.01 $ (0.08) $ (0.20) $ (0.14) $ (0.35) $ (0.15) $ (0.04) $ (0.40) [1] $ (0.68) [1] $ 0.30 [1]
[1] As a result of the conversion of the Company's preferred stock into 14.5 million shares of its Class B common stock immediately prior to the completion of the Company's initial public offering in March 2010, there is a lack of comparability in the basic and diluted net income (loss) per share amounts between the periods presented herein and any historical or future periods.