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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	Mar. 31, 2019	Dec. 31, 2018
Assets
Long-term restricted cash	$ 4,500	$ 4,500
Total assets measured at fair value	87,372	106,854
Liabilities
Financing derivative		16
Total liabilities measured at fair value		16
Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	38,205	18,844
Cash and money market funds [Member]
Assets
Total cash and cash equivalents	29,329	18,844
Commercial paper [Member]
Assets
Total cash and cash equivalents	8,876
Investments [Member]
Assets
Total investments	44,667	83,510
Commercial paper, not included with cash and cash equivalents [Member]
Assets
Total investments	31,306	53,469
Corporate debt securities [Member]
Assets
Total investments	6,979	10,214
U.S. government and agency securities, not included with cash and cash equivalents [Member]
Assets
Total investments	6,382	19,827
Level 1 [Member]
Assets
Long-term restricted cash	4,500	4,500
Total assets measured at fair value	33,829	23,344
Level 1 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	29,329	18,844
Level 1 [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	29,329	18,844
Level 2 [Member]
Assets
Total assets measured at fair value	53,543	83,510
Level 2 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	8,876
Level 2 [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	8,876
Level 2 [Member] | Investments [Member]
Assets
Total investments	44,667	83,510
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member]
Assets
Total investments	31,306	53,469
Level 2 [Member] | Corporate debt securities [Member]
Assets
Total investments	6,979	10,214
Level 2 [Member] | U.S. government and agency securities, not included with cash and cash equivalents [Member]
Assets
Total investments	$ 6,382	19,827
Level 3 [Member]
Liabilities
Financing derivative		16
Total liabilities measured at fair value		$ 16

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