Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balance (in shares) at Dec. 31, 2021	33,240
Balance at Dec. 31, 2021	$ 33	$ 559,883	$ (22,722)	$ 1,765	$ 538,959
Increase (Decrease) in Stockholders' Equity
Net income			41,614		41,614
Foreign currency translation adjustments				(1,186)	(1,186)
Change in pension obligation				9	9
Exercise of stock options (in shares)	41
Exercise of stock options		491			491
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	67
Issuance of common stock on restricted stock units, net of shares withheld		(3,315)			(3,315)
Stock-based compensation expense		2,701			2,701
Repurchase of common stock (in shares)	(284)
Repurchase of common stock		(5,127)	(14,873)		(20,000)
Balance (in shares) at Mar. 31, 2022	33,064
Balance at Mar. 31, 2022	$ 33	554,633	4,019	588	559,273
Balance (in shares) at Dec. 31, 2021	33,240
Balance at Dec. 31, 2021	$ 33	559,883	(22,722)	1,765	538,959
Increase (Decrease) in Stockholders' Equity
Net income					126,087
Foreign currency translation adjustments					(7,561)
Change in pension obligation					25
Balance (in shares) at Sep. 30, 2022	32,937
Balance at Sep. 30, 2022	$ 33	549,735	70,893	(5,771)	614,890
Balance (in shares) at Mar. 31, 2022	33,064
Balance at Mar. 31, 2022	$ 33	554,633	4,019	588	559,273
Increase (Decrease) in Stockholders' Equity
Net income			44,189		44,189
Foreign currency translation adjustments				(2,685)	(2,685)
Change in pension obligation				8	8
Exercise of stock options (in shares)	25
Exercise of stock options		298			298
Issuance of stock under Employee Stock Purchase Plan (in shares)	15
Issuance of stock under Employee Stock Purchase Plan		711			711
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	205
Issuance of common stock on restricted stock units, net of shares withheld		(5,896)			(5,896)
Stock-based compensation expense		3,527			3,527
Repurchase of common stock (in shares)	(215)
Repurchase of common stock		(3,872)	(8,626)		(12,498)
Balance (in shares) at Jun. 30, 2022	33,094
Balance at Jun. 30, 2022	$ 33	549,401	39,582	(2,089)	586,927
Increase (Decrease) in Stockholders' Equity
Net income			40,283		40,283
Foreign currency translation adjustments				(3,690)	(3,690)
Change in pension obligation				8	8
Exercise of stock options (in shares)	30
Exercise of stock options		367			367
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	8
Issuance of common stock on restricted stock units, net of shares withheld		(70)			(70)
Stock-based compensation expense		3,562			3,562
Repurchase of common stock (in shares)	(195)
Repurchase of common stock		(3,525)	(8,972)		(12,497)
Balance (in shares) at Sep. 30, 2022	32,937
Balance at Sep. 30, 2022	$ 33	549,735	70,893	(5,771)	614,890
Balance (in shares) at Dec. 31, 2022	32,775
Balance at Dec. 31, 2022	$ 33	550,299	118,892	(1,968)	667,256
Increase (Decrease) in Stockholders' Equity
Net income			47,697		47,697
Foreign currency translation adjustments				50	50
Exercise of stock options (in shares)	2
Exercise of stock options		25			25
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	56
Issuance of common stock on restricted stock units, net of shares withheld		(3,907)			(3,907)
Stock-based compensation expense		3,199			3,199
Repurchase of common stock (in shares)	(107)
Repurchase of common stock		(1,924)	(10,575)		(12,499)
Balance (in shares) at Mar. 31, 2023	32,726
Balance at Mar. 31, 2023	$ 33	547,692	156,014	(1,918)	701,821
Balance (in shares) at Dec. 31, 2022	32,775
Balance at Dec. 31, 2022	$ 33	550,299	118,892	(1,968)	667,256
Increase (Decrease) in Stockholders' Equity
Net income					175,207
Foreign currency translation adjustments					(2,192)
Balance (in shares) at Sep. 30, 2023	32,772
Balance at Sep. 30, 2023	$ 33	543,577	261,521	(4,160)	800,971
Balance (in shares) at Mar. 31, 2023	32,726
Balance at Mar. 31, 2023	$ 33	547,692	156,014	(1,918)	701,821
Increase (Decrease) in Stockholders' Equity
Net income			61,579		61,579
Foreign currency translation adjustments				(1,011)	(1,011)
Issuance of stock under Employee Stock Purchase Plan (in shares)	6
Issuance of stock under Employee Stock Purchase Plan		957			957
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	199
Issuance of common stock on restricted stock units, net of shares withheld		(11,558)			(11,558)
Stock-based compensation expense		4,749			4,749
Repurchase of common stock (in shares)	(95)
Repurchase of common stock		(1,720)	(10,780)		(12,500)
Balance (in shares) at Jun. 30, 2023	32,836
Balance at Jun. 30, 2023	$ 33	540,120	206,813	(2,929)	744,037
Increase (Decrease) in Stockholders' Equity
Net income			65,931		65,931
Foreign currency translation adjustments				(1,231)	(1,231)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	7
Issuance of common stock on restricted stock units, net of shares withheld		(349)			(349)
Stock-based compensation expense		5,082			5,082
Repurchase of common stock (in shares)	(71)
Repurchase of common stock		(1,276)	(11,223)		(12,499)
Balance (in shares) at Sep. 30, 2023	32,772
Balance at Sep. 30, 2023	$ 33	$ 543,577	$ 261,521	$ (4,160)	$ 800,971