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v3.20.2

Summary of Significant Accounting Policies (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 69,028 | $ 29,627
Total investments | 139,522 | 19,472
Long-term restricted cash | 3,500 | 4,000
Total assets measured at fair value | 212,050 | 53,099
Liabilities |  |
Financing derivative |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 41,784 | 18,644
Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 24,244 | 10,983
U.S. Treasury security [Member] |  |
Assets |  |
Total cash and cash equivalents | 3,000 |
Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 105,380 | 16,971
Corporate debt securities [Member] |  |
Assets |  |
Total investments | 21,195 | 2,501
U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 10,097 |
U.S. Treasury security, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 2,850 |
Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 41,784 | 18,644
Long-term restricted cash | 3,500 | 4,000
Total assets measured at fair value | 45,284 | 22,644
Liabilities |  |
Financing derivative |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Level 1 [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 41,784 | 18,644
Level 2 [Member] |  |
Assets |  |
Total cash and cash equivalents | 27,244 | 10,983
Total investments | 139,522 | 19,472
Total assets measured at fair value | 166,766 | 30,455
Liabilities |  |
Financing derivative |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Level 2 [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 24,244 | 10,983
Level 2 [Member] | U.S. Treasury security [Member] |  |
Assets |  |
Total cash and cash equivalents | 3,000 |
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 105,380 | 16,971
Level 2 [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 21,195 | 2,501
Level 2 [Member] | U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 10,097 |
Level 2 [Member] | U.S. Treasury security, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 2,850 |
Level 3 [Member] |  |
Liabilities |  |
Financing derivative |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |

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