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Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Jan. 15, 2020
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Concentration of credit risk      
Reverse stock split, conversion ratio 0.025    
Restricted cash   $ 264,000 $ 264,000
Long-term investments   0 0
Accounts and unbilled receivables   198,000 113,000
Unbilled receivables, current   $ 27,000  
Number of operating segments | segment   1  
Unrecognized tax benefits   $ 0 0
Revenues | Customer Concentration Risk | Michigan State University      
Concentration of credit risk      
Percentage of total revenue   94.00%  
U.S Government Grants      
Concentration of credit risk      
Accounts and unbilled receivables     $ 86,000