| Leasehold Improvements and Equipment | 9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2021 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, Plant and Equipment [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Leasehold Improvements and Equipment | Note 6 – Leasehold Improvements and Equipment 
 Leasehold improvements and equipment, summarized by major category, consist of the following as of September 30, 2021 and December 31, 2020: 
 
 
 Depreciation and amortization expense for the three and nine months ended September 30, 2021 was approximately $62 thousand and $179 thousand, respectively, and for the three and nine months ended September 30, 2020 was approximately $58 thousand and $173 thousand, respectively. During the three and nine months ended September 30, 2021 the Company purchased equipment and leasehold improvements of approximately $224 thousand. During the three and nine months ended September 30, 2020 the Company purchased equipment of approximately $0 and $6 thousand, respectively. 
 
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