Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Postemployment Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANSThe Company sponsors the AtriCure, Inc. 401(k) Plan (401(k) Plan), a defined contribution plan covering substantially all U.S. employees of the Company. Eligible employees may contribute pre-tax annual compensation up to specified maximums under the Internal Revenue Code. During the year ended December 31, 2021, 2020 and 2019, the Company made matching contributions of 50% on the first 6% of employee contributions to the 401(k) Plan. The Company’s matching contributions in 2021, 2020 and 2019 were $2,651, $2,237 and $1,915. Additional amounts may be contributed to the 401(k) Plan at the discretion of the Company’s Board of Directors, however, no such discretionary contributions were made in 2021, 2020 or 2019. The Company also provides retirement benefits for employees of AtriCure Europe B.V. and other foreign subsidiaries. Total contributions to retirement plans for these employees were $349, $244 and $248 in 2021, 2020 and 2019.