XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies [Line Items] |  |  |
Operating lease rent expense | $ 850 | $ 1,250 | $ 1,515
Royalty expense | $ 2,323 | $ 1,895 | $ 1,799
Minimum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Royalty rates | 3.00% |  |
Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Royalty rates | 5.00% |  |
Royalty agreement term | 20 years |  |
Office, Manufacturing, Warehouse Facilities, And Equipment [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expire at various terms | Dec. 31, 2022 |  |

X
- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
Name: | atrc_CommitmentsAndContingenciesLineItems
Namespace Prefix: | atrc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty agreement term. + References No definition available. + Details
Name: | atrc_RoyaltyAgreementTerm
Namespace Prefix: | atrc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty rate. + References No definition available. + Details
Name: | atrc_RoyaltyRate
Namespace Prefix: | atrc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OtherMachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |