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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 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 18,844 | $ 16,507
Total investments | 83,510 | 46,365
Long-term restricted cash | 4,500 | 4,500
Total assets measured at fair value | 106,854 | 67,372
Liabilities |  |
Financing derivative | 16 | 183
Total liabilities measured at fair value | 16 | 183
Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,844 | 14,858
Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 1,649
Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 53,469 | 20,394
Corporate debt securities [Member] |  |
Assets |  |
Total investments | 10,214 | 9,034
U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 19,827 | 16,937
Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,844 | 14,858
Long-term restricted cash | 4,500 | 4,500
Total assets measured at fair value | 23,344 | 19,358
Level 1 [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,844 | 14,858
Level 2 [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 1,649
Total investments | 83,510 | 46,365
Total assets measured at fair value | 83,510 | 48,014
Level 2 [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 1,649
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 53,469 | 20,394
Level 2 [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 10,214 | 9,034
Level 2 [Member] | U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 19,827 | 16,937
Level 3 [Member] |  |
Liabilities |  |
Financing derivative | 16 | 183
Total liabilities measured at fair value | $ 16 | $ 183

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