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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total assets measured at fair value | $ 53,204 | $ 106,854
Liabilities |  |
Financing derivative |  | 16
Total liabilities measured at fair value |  | 16
Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 33,084 | 18,844
Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,505 | 18,844
Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,579 |
Investments [Member] |  |
Assets |  |
Total investments | 16,120 | 83,510
Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 12,118 | 53,469
Corporate debt securities [Member] |  |
Assets |  |
Total investments | 4,002 | 10,214
U.S. government and agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments |  | 19,827
Certified deposits [Member] |  |
Assets |  |
Long-term restricted cash | 4,000 | 4,500
Level 1 [Member] |  |
Assets |  |
Total assets measured at fair value | 22,505 | 23,344
Level 1 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,505 | 18,844
Level 1 [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 18,505 | 18,844
Level 1 [Member] | Certified deposits [Member] |  |
Assets |  |
Long-term restricted cash | 4,000 | 4,500
Level 2 [Member] |  |
Assets |  |
Total assets measured at fair value | 30,699 | 83,510
Level 2 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,579 |
Level 2 [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,579 |
Level 2 [Member] | Investments [Member] |  |
Assets |  |
Total investments | 16,120 | 83,510
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 12,118 | 53,469
Level 2 [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | $ 4,002 | 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
Total liabilities measured at fair value |  | $ 16

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