Net Income Per Share (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	$ 4,318	$ 7,522
Shares used to compute basic net income per share (in shares)	35,521	35,114
Dilutive potential common shares
Stock options (in shares)	67	105
Unvested restricted stock awards (in shares)	294	272
Shares used to compute diluted net income per share (in shares)	35,882	35,491
Basic net income per share (in dollars per share)	$ 0.12	$ 0.21
Diluted net income per share (in dollars per share)	$ 0.12	$ 0.21
Dilutive securities included in the calculation (in shares)	856	979
Anti-dilutive securities excluded from the calculation (in shares)	1,144	1,135