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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 62,655 $ 56,608 $ 52,500 $ 53,764 $ 60,316 $ 52,833 $ 49,189 $ 50,290 $ 225,527 $ 212,628 $ 232,223
Gross profit 49,194 43,485 41,078 41,622 46,876 40,913 37,918 38,040 175,379 163,747 180,327
Net income (loss) $ 7,841 $ 6,464 $ 3,808 $ (297) $ 51 $ 173 $ (5,771) $ (12,272) $ 17,816 $ (17,819) $ (27,617)
Net income (loss) per share - diluted (in dollars per share) $ 0.10 $ 0.08 $ 0.05 $ 0 $ 0 $ 0 $ (0.08) $ (0.16) $ 0.22 $ (0.23) $ (0.38)
Net income (loss) per share - basic (in dollars per share) $ 0.10 $ 0.08 $ 0.05 $ 0 $ 0 $ 0 $ (0.08) $ (0.16) $ 0.23 $ (0.23) $ (0.38)