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Quarterly Financial Results (Unaudited) - Schedule of Unaudited Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Data [Abstract]                      
Revenue $ 158,153 $ 150,462 $ 145,031 $ 135,270 $ 126,090 $ 119,125 $ 110,296 $ 98,575 $ 588,916 $ 454,086 $ 316,861
Cost of revenue 10,560 9,392 8,628 7,720 6,871 6,412 5,959 5,569 36,300 [1] 24,811 [1] 17,609 [1]
Gross profit 147,593 141,070 136,403 127,550 119,219 112,713 104,337 93,006 552,616 429,275 299,252
Income from operations 13,635 9,704 3,548 7,435 6,902 5,877 3,953 6,459 34,322 23,191 15,274
Net income $ 13,171 $ 10,384 $ 6,007 $ 12,584 $ 12,450 $ 13,882 $ 33,343 $ 5,495 $ 42,146 $ 65,170 $ 13,199
Basic net income per share $ 0.12 [2] $ 0.09 [2] $ 0.05 [2] $ 0.11 [2] $ 0.11 [2] $ 0.13 [2] $ 0.31 [2] $ 0.05 [2] $ 0.38 $ 0.60 $ 0.13
Diluted net income per share $ 0.12 [2] $ 0.09 [2] $ 0.05 [2] $ 0.11 [2] $ 0.11 [2] $ 0.12 [2] $ 0.29 [2] $ 0.05 [2] $ 0.37 $ 0.57 $ 0.12
[1] Includes depreciation and amortization expense for the years ended December 31, 2019, 2018, and 2017 of $3,263 $2,225, and $1,140, respectively.
[2] The amounts were computed independently for each quarter, and the sum of the quarters may not total the annual amounts.