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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 29,627 | $ 18,844
Total investments | 19,472 | 83,510
Long-term restricted cash | 4,000 | 4,500
Total assets measured at fair value | 53,099 | 106,854
Liabilities |  |
Financing derivative |  | 16
Continuation Advances |  |
Total liabilities measured at fair value |  | 16
Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,644 | 18,844
Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 10,983 |
Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 16,971 | 53,469
Corporate debt securities [Member] |  |
Assets |  |
Total investments | 2,501 | 10,214
U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments |  | 19,827
Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,644 | 18,844
Long-term restricted cash | 4,000 | 4,500
Total assets measured at fair value | 22,644 | 23,344
Liabilities |  |
Continuation Advances |  |
Level 1 [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,644 | 18,844
Level 2 [Member] |  |
Assets |  |
Total cash and cash equivalents | 10,983 |
Total investments | 19,472 | 83,510
Total assets measured at fair value | 30,455 | 83,510
Liabilities |  |
Continuation Advances |  |
Level 2 [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 10,983 |
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 16,971 | 53,469
Level 2 [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 2,501 | 10,214
Level 2 [Member] | U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments |  | 19,827
Level 3 [Member] |  |
Liabilities |  |
Financing derivative |  | 16
Continuation Advances |  |
Total liabilities measured at fair value |  | $ 16

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