Summary of Significant Accounting Policies - Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Anti-dilutive common equivalent shares excluded from calculation	2,554	1,951	232,844
Net income per share:
Net income available to common stockholders	$ 98,650	$ 49,982	$ 17,034
Weighted average common shares outstanding used in computing basic income per share	33,555	33,257	32,559
Incremental options and RSUs	713	871	1,269
Weighted average common shares used in computing diluted net income per share	34,268	34,128	33,828
Net income per share
Basic	$ 2.94	$ 1.50	$ 0.52
Diluted	$ 2.88	$ 1.46	$ 0.50