Reconciliation of Basic and Diluted Shares Amounts (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 128,291	$ 59,926	$ 21,411
Weighted average shares used in computing net income per share - basic	55,015	52,554	48,343
Effect of dilutive shares:
Options and stock units	915	971	864
Convertible Senior Notes	1,253	367
Dilutive effect of unvested performance stock units	81	0	0
Dilutive potential common shares	2,249	1,338	864
Weighted average shares used in computing net income per share - diluted	57,264	53,892	49,206
Earnings Per Share, Basic and Diluted [Abstract]
Basic	$ 2.33	$ 1.14	$ 0.44
Diluted	$ 2.24	$ 1.11	$ 0.44