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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, 2018	Dec. 31, 2017
Assets
Total assets measured at fair value	$ 67,991	$ 67,372
Liabilities
Total liabilities measured at fair value	40	183
Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	40	183
Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	23,058	16,507
Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	16,438	14,858
Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	6,620	1,649
Investments [Member]
Assets
Total investments	40,433	46,365
Investments [Member] | Commercial paper [Member]
Assets
Total investments	22,062	20,394
Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	4,369	9,034
Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	14,002	16,937
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	20,938	19,358
Level 1 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	16,438	14,858
Level 1 [Member] | Cash and cash equivalents [Member] | Cash and money market funds [Member]
Assets
Total cash and cash equivalents	16,438	14,858
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	47,053	48,014
Level 2 [Member] | Cash and cash equivalents [Member]
Assets
Total cash and cash equivalents	6,620	1,649
Level 2 [Member] | Cash and cash equivalents [Member] | Commercial paper [Member]
Assets
Total cash and cash equivalents	6,620	1,649
Level 2 [Member] | Investments [Member]
Assets
Total investments	40,433	46,365
Level 2 [Member] | Investments [Member] | Commercial paper [Member]
Assets
Total investments	22,062	20,394
Level 2 [Member] | Investments [Member] | Corporate debt securities [Member]
Assets
Total investments	4,369	9,034
Level 2 [Member] | Investments [Member] | U.S. government and agency securities [Member]
Assets
Total investments	14,002	16,937
Level 3 [Member]
Liabilities
Total liabilities measured at fair value	40	183
Level 3 [Member] | Financing Derivative [Member]
Liabilities
Total liabilities measured at fair value	$ 40	$ 183

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