CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings Reclassify upon adoption of ASU	Retained Earnings	Accumulated Other Comprehensive Income (Loss) Reclassify upon adoption of ASU	Accumulated Other Comprehensive Income (Loss)	Reclassify upon adoption of ASU	Total
Beginning balance (ASU 2016-02) at Dec. 31, 2018		$ 93				$ 93
Beginning balance (ASU 2018-02) at Dec. 31, 2018		(748)		$ 748
Beginning balance at Dec. 31, 2018	$ 571,383		$ 363,425		$ (2,033)		$ 932,775
Beginning balance (in shares) at Dec. 31, 2018	54,893
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			5,451				5,451
Other comprehensive loss					(4,009)		(4,009)
Stock-based compensation expense	$ 9,382						9,382
Options exercised	$ 4,930						4,930
Options exercised (in shares)	288
Issuance of common stock under Employee Stock Purchase Plan	$ 1,415						1,415
Issuance of common stock under Employee Stock Purchase Plans (in shares)	35
Shares surrendered in exchange for exercise of stock options	$ (93)						$ (93)
Shares surrendered in exchange for exercise of stock options (in shares)	(3)						(3)
Ending balance (ASU 2016-13) at Dec. 31, 2019		$ (575)				$ (575)
Ending balance at Dec. 31, 2019	$ 587,017		368,221		(5,294)		$ 949,944
Ending balance (in shares) at Dec. 31, 2019	55,213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			(9,843)				(9,843)
Other comprehensive loss					(158)		(158)
Stock-based compensation expense	$ 13,433						13,433
Options exercised	$ 6,948						6,948
Options exercised (in shares)	442
Issuance of common stock under Employee Stock Purchase Plan	$ 1,159						1,159
Issuance of common stock under Employee Stock Purchase Plans (in shares)	30
Shares surrendered in exchange for payment of payroll tax liabilities	$ (866)						(866)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares)	(23)
Shares surrendered in exchange for exercise of stock options	$ (1,467)						$ (1,467)
Shares surrendered in exchange for exercise of stock options (in shares)	(39)						(39)
Ending balance at Dec. 31, 2020	$ 606,224		357,803		(5,452)		$ 958,575
Ending balance (in shares) at Dec. 31, 2020	55,623						55,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			48,454				$ 48,454
Other comprehensive loss					(2,539)		(2,539)
Stock-based compensation expense	$ 14,579						14,579
Options exercised	$ 20,374						$ 20,374
Options exercised (in shares)	883						883
Issuance of common stock under Employee Stock Purchase Plan	$ 1,112						$ 1,112
Issuance of common stock under Employee Stock Purchase Plans (in shares)	18
Shares issued from time-vested restricted stock units (in shares)	59
Shares surrendered in exchange for payment of payroll tax liabilities	$ (576)						(576)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares)	(10)
Shares surrendered in exchange for exercise of stock options	$ (180)						$ (180)
Shares surrendered in exchange for exercise of stock options (in shares)	(3)						(3)
Ending balance at Dec. 31, 2021	$ 641,533		$ 406,257		$ (7,991)		$ 1,039,799
Ending balance (in shares) at Dec. 31, 2021	56,570						56,570