Annual report pursuant to Section 13 and 15(d)

Quarterly Summary of Information (Unaudited) - Summary of Quarterly Unaudited Financial Data (Details)

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Quarterly Summary of Information (Unaudited) - Summary of Quarterly Unaudited Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]                      
Net revenue $ 40,446 $ 40,778 $ 44,029 $ 33,752 $ 29,118 $ 29,393 $ 30,393 $ 23,633 $ 159,005 $ 112,537 $ 75,443
Gross profit 20,038 19,375 20,822 16,023 13,816 14,649 15,114 11,938 76,258 55,517 38,991
Net income $ 3,858 $ 2,696 $ 3,459 $ 1,572 $ 1,519 $ 2,133 $ 2,286 $ 888 $ 11,585 $ 6,826 $ 25,435
Net income (loss) per share attributable to common stockholders                      
Net income (loss) per share - basic common stock $ 0.20 $ 0.14 $ 0.18 $ 0.08 $ 0.08 $ 0.12 $ 0.13 $ (0.01) $ 0.60 $ 0.33 $ 0.76
Net income (loss) per share - diluted common stock $ 0.19 $ 0.13 $ 0.17 $ 0.08 $ 0.07 $ 0.11 $ 0.11 $ (0.01) $ 0.56 $ 0.30 $ 0.68