Income Taxes (Narrative) (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2021
USD ($)
item
|
Dec. 31, 2020
USD ($)
|
|
| Income Tax Disclosure [Line Items] | ||
| Effective tax rate | ||
| Number of CARES Act provisions company is able to benefit from | item | 1 | |
| Expected refund for AMT credit carryforward | $ 212,000 | |
| Valuation allowance | 30,414,000 | $ 33,892,000 |
| Net operating loss carryforwards | 105,077,000 | |
| Research and development tax credit carryforwards | 2,237,000 | 2,450,000 |
| Unrecognized tax benefits | 0 | 0 |
| Unrecognized tax benefits, interest and penalties | 0 | $ 0 |
| Indefinite [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Net operating loss carryforwards | 16,400,000 | |
| Tax Year 2000 [Member] | Expired [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Net operating loss carryforwards | 13,800,000 | |
| Tax Year 2001 [Member] | Expired [Member] | ||
| Income Tax Disclosure [Line Items] | ||
| Net operating loss carryforwards | $ 14,400,000 | |