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Revenue (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018
Open-heart Ablation [Member]
Disaggregation of Revenue [Line Items]
Revenue allocation percentage	60.00%
Minimally Invasive Ablation [Member]
Disaggregation of Revenue [Line Items]
Revenue allocation percentage	40.00%

X

- Definition

Revenue allocation percentage.

+ References

No definition available.

+ Details

Name:	atrc_RevenueAllocationPercentage
Namespace Prefix:	atrc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ProductOrServiceAxis=atrc_OpenheartMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=atrc_MinimallyInvasiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: