Significant Accounting Policies (Narrative) (Details) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2020
USD ($)
ft²
|
Jun. 30, 2019
USD ($)
|
Jun. 30, 2020
USD ($)
ft²
|
Jun. 30, 2019
USD ($)
|
Dec. 31, 2019
USD ($)
|
|
Summary Of Significant Accounting Policies [Line Items] | |||||
Certificates of deposit | $ 13,000 | ||||
Reimbursement from National Institutes of Health research grants | $ 1,100 | $ 1,400 | $ 2,400 | $ 2,200 | |
Leases, discount rate | 5.50% | 5.50% | |||
Reduction of non-current lease liability and offsetting reduction in right-of-use assets | $ 22,500 | $ 22,500 | $ 45,000 | $ 45,000 | |
Austin [Member] | |||||
Summary Of Significant Accounting Policies [Line Items] | |||||
Office space | ft² | 6,000 | 6,000 | |||
Lease expiration date | Dec. 31, 2020 |