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Summary Of Significant Accounting Policies (Summary Of Assets And Liabilities Measured At Fair Value Classified Based On Level Of Input) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Total assets measured at fair value	$ 76,478	$ 86,770
Liabilities
Total liabilities measured at fair value	356	600
Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	356	600
Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	16,765	33,629
Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	14,516	22,034
Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	2,249	8,595
Cash and cash equivalents [Member] | U.S. government and agency securities [Member]
Assets
Total cash and cash equivalents		3,000
Investments [Member]
Assets
Total investments	55,213	48,641
Investments [Member] | Commercial paper [Member]
Assets
Total investments	23,583	15,903
Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	10,739	1,265
Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	20,579	28,136
Investments [Member] | Asset backed securities [Member]
Assets
Total investments	312	3,337
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	19,016	26,534
Level 1 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	14,516	22,034
Level 1 [Member] | Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	14,516	22,034
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	57,462	60,236
Level 2 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	2,249	11,595
Level 2 [Member] | Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	2,249	8,595
Level 2 [Member] | Cash and cash equivalents [Member] | U.S. government and agency securities [Member]
Assets
Total cash and cash equivalents		3,000
Level 2 [Member] | Investments [Member]
Assets
Total investments	55,213	48,641
Level 2 [Member] | Investments [Member] | Commercial paper [Member]
Assets
Total investments	23,583	15,903
Level 2 [Member] | Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	10,739	1,265
Level 2 [Member] | Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	20,579	28,136
Level 2 [Member] | Investments [Member] | Asset backed securities [Member]
Assets
Total investments	312	3,337
Level 3 [Member]
Liabilities
Total liabilities measured at fair value	356	600
Level 3 [Member] | Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	$ 356	$ 600

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