COMMITMENTS (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Future minimum commitments
2014	$ 6,424
2015	5,107
2016	4,504
2017	3,588
2018	3,075
Thereafter	10,301
Net Minimum commitments	32,999
Minimum Lease Payments
Future minimum commitments
2014	6,398
2015	5,188
2016	4,587
2017	3,609
2018	3,075
Thereafter	10,301
Net Minimum commitments	33,158
Other
Future minimum commitments
2014	105
2015	0
Net Minimum commitments	105
Sub-lease Income
Future minimum commitments
2014	79
2015	81
2016	83
2017	21
2018	0
Thereafter	0
Net Minimum commitments	$ 264

The total amount of future minimum payments due relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitment
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due after the fifth year from the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentAfterFifthYear
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due in the fifth year after the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentInYearFive
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due in the fourth year after the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentInYearFour
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due in the first year after the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentInYearOne
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due in the third year after the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentInYearThree
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of payments due in the second year after the balance sheet date relating to commitments entered into by the entity.

No definition available.

Name:	artc_FutureMinimumCommitmentInYearTwo
Namespace Prefix:	artc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	artc_FutureMinimumCommitmentsLineItems
Namespace Prefix:	artc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration