Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities:
Net loss	$ (13,204)	$ (29,130)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation expense	33,425	30,020
Depreciation	9,093	8,273
Amortization of intangible assets	6,331	5,634
Amortization of deferred financing costs	359	359
Amortization of investments	0	107
Loss on debt extinguishment	0	1,362
Acquired in-process research and development expense	5,000	0
Other non-cash adjustments	726	725
Changes in operating assets and liabilities:
Accounts receivable	(1,855)	(2,238)
Inventories	(2,711)	(8,571)
Other current assets	(1,687)	1,107
Accounts payable	315	4,239
Accrued liabilities	3,292	(4,762)
Other noncurrent assets and liabilities	(1,777)	(757)
Net cash provided by operating activities	37,307	6,368
Cash flows from investing activities:
Sales and maturities of available-for-sale securities	0	53,668
Purchases of property and equipment	(7,448)	(8,766)
Proceeds from sale of property and equipment	0	25
Acquisitions, including in-process research and development	(5,000)	0
Proceeds from capital grant	500	0
Net cash (used in) provided by investing activities	(11,948)	44,927
Cash flows from financing activities:
Proceeds from revolving credit facility, net of financing costs	0	61,210
Payments on debt, leases and financing obligation	(880)	(62,598)
Proceeds from financing obligation	6,250	0
Payment of financing costs and bank fees	0	(1,069)
Proceeds from stock option exercises and employee stock purchase plan	4,643	3,875
Shares repurchased for payment of taxes on stock awards	(10,935)	(6,759)
Net cash used in financing activities	(922)	(5,341)
Effect of exchange rate changes on cash and cash equivalents	707	71
Net increase in cash and cash equivalents	25,144	46,025
Cash and cash equivalents—beginning of period	122,721	84,310
Cash and cash equivalents—end of period	147,865	130,335
Supplemental cash flow information:
Cash paid for interest	3,919	3,601
Cash paid for taxes, net of refunds	1,630	576
Non-cash investing and financing activities:
Accrued purchases of property and equipment	$ 333	$ 1,184

Proceeds From Stock Options Exercised And Employee Stock Purchase Plan

No definition available.

Name:	atrc_ProceedsFromStockOptionsExercisedAndEmployeeStockPurchasePlan
Namespace Prefix:	atrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.