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	Total
Beginning balance (ASU 2016-13) at Dec. 31, 2019		$ (575)			$ (575)
Beginning balance at Dec. 31, 2019	$ 587,017		$ 368,221	$ (5,294)		$ 949,944
Beginning balance (in shares) at Dec. 31, 2019	55,213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			(3,154)			(3,154)
Other comprehensive loss				(9,465)		(9,465)
Stock-based compensation expense	$ 2,641					2,641
Options exercised	$ 2,369					2,369
Options exercised (in shares)	174
Issuance of common stock under Employee Stock Purchase Plan	$ 371					371
Issuance of common stock under Employee Stock Purchase Plans (in shares)	13
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)
Ending balance at Mar. 31, 2020	$ 590,065		364,492	(14,759)		939,798
Ending balance (in shares) at Mar. 31, 2020	55,338
Beginning balance at Dec. 31, 2020	$ 606,224		357,803	(5,452)		$ 958,575
Beginning balance (in shares) at Dec. 31, 2020	55,623					55,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			10,958			$ 10,958
Other comprehensive 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					55,933