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Earnings Per Share - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share (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
Numerator:                      
Net income $ 13,171 $ 10,384 $ 6,007 $ 12,584 $ 12,450 $ 13,882 $ 33,343 $ 5,495 $ 42,146 $ 65,170 $ 13,199
Net income attributable to participating securities                     (6,098)
Net income attributable to common stockholders — basic                 42,146 65,170 7,101
Net income attributable to participating securities                     (5,829)
Net income attributable to common stockholders — diluted                 $ 42,146 $ 65,170 $ 7,370
Denominator:                      
Weighted–average number of shares of common stock used in computing net income per share attributable to common stockholders — basic                 111,450,443 108,833,028 55,835,265
Dilutive effect of share equivalents resulting from stock options                 1,155,906 3,009,748 4,290,362
Dilutive effect of share equivalents resulting from unvested restricted stock units                 825,501 1,521,936 511,957
Weighted–average number of shares of common stock used in computing net income per share — diluted                 113,431,850 113,364,712 60,637,584
Net income per share attributable to common stockholders:                      
Basic $ 0.12 [1] $ 0.09 [1] $ 0.05 [1] $ 0.11 [1] $ 0.11 [1] $ 0.13 [1] $ 0.31 [1] $ 0.05 [1] $ 0.38 $ 0.60 $ 0.13
Diluted $ 0.12 [1] $ 0.09 [1] $ 0.05 [1] $ 0.11 [1] $ 0.11 [1] $ 0.12 [1] $ 0.29 [1] $ 0.05 [1] $ 0.37 $ 0.57 $ 0.12
[1] The amounts were computed independently for each quarter, and the sum of the quarters may not total the annual amounts.