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Summary Of Significant Accounting Policies (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Total assets measured at fair value	$ 107,096	$ 76,478
Liabilities
Total liabilities measured at fair value	15	356
Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	15	356
Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	36,478	16,765
Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	17,160	14,516
Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	19,318	2,249
Investments [Member]
Assets
Total investments	66,118	55,213
Investments [Member] | Commercial paper [Member]
Assets
Total investments	29,640	23,583
Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	9,715	10,739
Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	26,763	20,579
Investments [Member] | Asset backed securities [Member]
Assets
Total investments		312
Long-term restricted cash [Member] | Cash [Member]
Assets
Long-term restricted cash	4,500	4,500
Level 1 [Member]
Assets
Total assets measured at fair value	21,660	19,016
Level 1 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	17,160	14,516
Level 1 [Member] | Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	17,160	14,516
Level 1 [Member] | Long-term restricted cash [Member] | Cash [Member]
Assets
Long-term restricted cash	4,500	4,500
Level 2 [Member]
Assets
Total assets measured at fair value	85,436	57,462
Level 2 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	19,318	2,249
Level 2 [Member] | Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	19,318	2,249
Level 2 [Member] | Investments [Member]
Assets
Total investments	66,118	55,213
Level 2 [Member] | Investments [Member] | Commercial paper [Member]
Assets
Total investments	29,640	23,583
Level 2 [Member] | Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	9,715	10,739
Level 2 [Member] | Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	26,763	20,579
Level 2 [Member] | Investments [Member] | Asset backed securities [Member]
Assets
Total investments		312
Level 3 [Member]
Liabilities
Total liabilities measured at fair value	15	356
Level 3 [Member] | Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	$ 15	$ 356

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