CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance at Dec. 31, 2020	$ 606,224	$ 357,803	$ (5,452)	$ 958,575
Beginning balance (in shares) at Dec. 31, 2020	55,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		10,958		10,958
Other comprehensive income (loss)			(1,730)	(1,730)
Stock-based compensation expense	$ 3,310			3,310
Options exercised	$ 5,897			5,897
Options exercised (in shares)	291
Issuance of common stock under Employee Stock Purchase Plan	$ 263			263
Issuance of common stock under Employee Stock Purchase Plans (in shares)	5
Shares issued from time-vested restricted stock units (in shares)	25
Shares surrendered in exchange for payment of payroll tax liabilities	$ (488)			(488)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares)	(9)
Shares surrendered in exchange for exercise of stock options	$ (93)			(93)
Shares surrendered in exchange for exercise of stock options (in shares)	(2)
Ending balance at Mar. 31, 2021	$ 615,113	368,761	(7,182)	976,692
Ending balance (in shares) at Mar. 31, 2021	55,933
Beginning balance at Dec. 31, 2021	$ 641,533	406,257	(7,991)	$ 1,039,799
Beginning balance (in shares) at Dec. 31, 2021	56,570			56,570
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		10,545		$ 10,545
Other comprehensive income (loss)			1,338	1,338
Stock-based compensation expense	$ 4,212			4,212
Options exercised	$ 1,320			1,320
Options exercised (in shares)	52
Issuance of common stock under Employee Stock Purchase Plan	$ 320			320
Issuance of common stock under Employee Stock Purchase Plans (in shares)	5
Shares issued from time-vested restricted stock units (in shares)	44
Shares surrendered in exchange for payment of payroll tax liabilities	$ (1,015)			(1,015)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares)	(16)
Ending balance at Mar. 31, 2022	$ 646,370	$ 416,802	$ (6,653)	$ 1,056,519
Ending balance (in shares) at Mar. 31, 2022	56,655			56,655