Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE - value at Dec. 31, 2019	$ 279,399	$ 6	$ 302,189	$ (23,091)	$ 295
BALANCE - shares at Dec. 31, 2019		64,283
Share-based compensation, value	4,891		4,891
Share-based compensation, shares		80
Vesting of restricted stock units and impact of shares withheld for taxes, value	(2,174)		(2,174)
Vesting of restricted stock units and impact of shares withheld for taxes, shares		432
Exercise of stock options and purchases from employee stock purchase plan, value	1,956		1,956
Exercise of stock options and purchases from employee stock purchase plan, shares		275
Repurchase of common stock, value	(3,860)		(1,792)	(2,068)
Repurchase of common stock, shares		(425)
Net income	55,494			55,494
Other comprehensive income (loss)—net of tax	(2,807)				(2,807)
BALANCE - value at Sep. 30, 2020	332,899	$ 6	305,070	30,335	(2,512)
BALANCE - shares at Sep. 30, 2020		64,645
BALANCE - value at Jun. 30, 2020	321,002	$ 6	304,531	19,856	(3,391)
BALANCE - shares at Jun. 30, 2020		64,947
Share-based compensation, value	1,761		1,761
Share-based compensation, shares		19
Vesting of restricted stock units and impact of shares withheld for taxes, value	(68)		(68)
Vesting of restricted stock units and impact of shares withheld for taxes, shares		20
Exercise of stock options and purchases from employee stock purchase plan, value	638		638
Exercise of stock options and purchases from employee stock purchase plan, shares		84
Repurchase of common stock, value	(3,860)		(1,792)	(2,068)
Repurchase of common stock, shares		(425)
Net income	12,547			12,547
Other comprehensive income (loss)—net of tax	879				879
BALANCE - value at Sep. 30, 2020	332,899	$ 6	305,070	30,335	(2,512)
BALANCE - shares at Sep. 30, 2020		64,645
BALANCE - value at Dec. 31, 2020	346,668	$ 6	304,757	40,937	968
BALANCE - shares at Dec. 31, 2020		65,023
Share-based compensation, value	3,772		3,772
Share-based compensation, shares		131
Vesting of restricted stock units and impact of shares withheld for taxes, value	(3,785)		(3,785)
Vesting of restricted stock units and impact of shares withheld for taxes, shares		431
Exercise of stock options and purchases from employee stock purchase plan, value	2,321		2,321
Exercise of stock options and purchases from employee stock purchase plan, shares		152
Net income	24,725			24,725
Other comprehensive income (loss)—net of tax	1,079				1,079
BALANCE - value at Sep. 30, 2021	374,780	$ 6	307,065	65,662	2,047
BALANCE - shares at Sep. 30, 2021		65,737
BALANCE - value at Jun. 30, 2021	360,097	$ 6	304,977	51,856	3,258
BALANCE - shares at Jun. 30, 2021		65,654
Share-based compensation, value	1,207		1,207
Share-based compensation, shares		58
Vesting of restricted stock units and impact of shares withheld for taxes, shares		21
Exercise of stock options and purchases from employee stock purchase plan, value	881		881
Exercise of stock options and purchases from employee stock purchase plan, shares		4
Net income	13,806			13,806
Other comprehensive income (loss)—net of tax	(1,211)				(1,211)
BALANCE - value at Sep. 30, 2021	$ 374,780	$ 6	$ 307,065	$ 65,662	$ 2,047
BALANCE - shares at Sep. 30, 2021		65,737