Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Detail)

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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (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
Schedule Of Quarterly Financial Data [Line Items]                      
Net revenue $ 24,830 $ 27,795 $ 24,420 $ 20,683 $ 19,296 $ 17,639 $ 18,094 $ 16,908 $ 97,728 $ 71,937 $ 68,701
Gross profit 15,704 17,467 15,122 12,416 11,723 11,332 11,435 10,831 60,709 45,321 47,141
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 (loss) per share:                      
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.