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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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 10,384	$ 6,007	$ 12,584	$ 13,882	$ 33,343	$ 5,495	$ 28,975	$ 52,720
Denominator:
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders — basic	111,662,949			109,628,692			111,257,271	108,367,270
Dilutive effect of share equivalents resulting from stock options	1,052,758			2,259,533			1,232,754	3,396,906
Dilutive effect of share equivalents resulting from unvested restricted stock units	649,068			1,713,190			899,670	1,586,974
Weighted-average number of shares of common stock used in computing net income per share — diluted	113,364,775			113,601,415			113,389,695	113,351,150
Net income per share attributable to common stockholders:
Basic	$ 0.09			$ 0.13			$ 0.26	$ 0.49
Diluted	$ 0.09			$ 0.12			$ 0.26	$ 0.47

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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