Significant Accounting Policies (Useful Lives Of Each Class Of Assets) (Details) - Weighted Average [Member]	12 Months Ended
Dec. 31, 2016
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	13 years
Furniture And Fixtures [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	5 years
Equipment And Software [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	3 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration