Net Income per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 8,974	$ 7,026
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted-average shares of common stock outstanding	31,637	31,376
Shares used in computing basic net income per share	31,637	31,376
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Restricted stock subject to vesting	529	542
Shares issuable for acquisition consideration (in shares)	181	296
Shares issuable for conversion of convertible senior notes (in shares)	529
Shares used in computing diluted net income per share	32,876	32,214
Basic net income per share (in dollars per share)	$ 0.28	$ 0.22
Diluted net income per share (in dollars per share)	$ 0.27	$ 0.22