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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, 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