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Component: (Network and Table)
Network
40902 - Disclosure - Shareholders' Equity (Fair Value of Option Grants) (Details)
(http://www.arthrt.com/role/DisclosureShareholdersEquityFairValueOfOptionGrantsDetails)
TableFair Value Measurements, Recurring and Nonrecurring [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000819689 (http://www.sec.gov/CIK)
Fair Value, Option, Quantitative Disclosures [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Range [Axis]Range [Axis]
Minimum [Member]Maximum [Member]Minimum [Member]Maximum [Member]
Expected option term, years
P6Y  
P6Y6M  
P4Y  
P6Y6M  
Expected volatility factor
23.70%  
24.40%  
23.80%  
26.70%  
Risk-free rate
0.90%  
0.99%  
0.90%  
1.28%