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Investments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016
Minimum [Member]
Investment [Line Items]
Long term marketable debt securities maturity period	1 year
Maximum [Member]
Investment [Line Items]
Long term marketable debt securities maturity period	2 years

X

- Definition

Long Term Investment Maturity Period

+ References

No definition available.

+ Details

Name:	atrc_LongTermInvestmentMaturityPeriod
Namespace Prefix:	atrc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	invest_InvestmentLineItems
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: