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Income Taxes - Components of Income Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]                      
United States                 $ 22,553 $ 40,245 $ 29,121
Foreign                 1,719 210 535
Income before provision (benefit) for income taxes $ (4,237) $ 8,753 $ 13,684 $ 6,072 $ 5,823 $ 11,299 $ 13,646 $ 9,687 $ 24,272 $ 40,455 $ 29,656