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v3.8.0.1

Investments (Narrative) (Details) | 12 Months Ended
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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: |