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Commitments (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) ft² | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) ft² | Jun. 30, 2021 USD ($) | Aug. 04, 2021 ft²
Operating Leased Assets [Line Items] |  |  |  |  |
Cash paid for operating lease liabilities | $ | $ 41 | $ 27 | $ 82 | $ 27 |
Building [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Rent expense | $ | $ 41 | $ 34 | $ 82 | $ 57 |
Austin, Texas [Member] | Operating Leases [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Office space | 6,000 |  | 6,000 |  |
Lease expiration date |  |  | Apr. 30, 2024 |  |
Austin, Texas [Member] | Short-Term Operating Lease [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Office space | 3,600 |  | 3,600 |  |
Lease expiration date |  |  | Oct. 31, 2022 |  |
Austin, Texas [Member] | Building [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Office space |  |  |  |  | 90,000

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