Summary Of Significant Accounting Policies (Fair Value Of Financial Assets Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Total assets measured at fair value	$ 20,501
Liabilities
Total liabilities measured at fair value	0	$ 0
Cash and cash equivalents [Member] | Money market funds [Member]
ASSETS
Total cash and cash equivalents	20,006
Investments [Member] | Commercial paper [Member]
ASSETS
Total investments	495
Level 1 [Member]
ASSETS
Total assets measured at fair value	20,006
Level 1 [Member] | Cash and cash equivalents [Member] | Money market funds [Member]
ASSETS
Total cash and cash equivalents	20,006
Level 2 [Member]
ASSETS
Total assets measured at fair value	495
Level 2 [Member] | Investments [Member] | Commercial paper [Member]
ASSETS
Total investments	$ 495