Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncement (Details)

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Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncement (Details) - USD ($)
Mar. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use asset $ 188,000 $ 212,000 $ 0 [1]    
Property, Plant and Equipment, Net 231,000   162,000 [1]    
Total assets 16,972,000   19,391,000 [1]    
Operating lease liabilities, current 146,000 148,000      
Operating lease liabilities, non-current 143,000 179,000      
Total liabilities 3,986,000   3,014,000 [1]    
Accumulated deficit (216,074,000)   (212,203,000) [1]    
Total stockholders' equity 12,986,000   16,377,000 [1] $ 9,920,000 $ 7,316,000
Total liabilities and stockholders' equity 16,972,000   19,391,000 [1]    
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Total stockholders' equity 33,000        
Accounting Standards Update 2016-02 Leases          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use asset   212,000      
Property, Plant and Equipment, Net     162,000    
Total assets     19,391,000    
Deferred rent     58,000    
Total liabilities     3,014,000    
Accumulated deficit     (212,203,000)    
Total stockholders' equity     16,377,000    
Total liabilities and stockholders' equity     $ 19,391,000    
Accounting Standards Update 2016-02 Leases | Balance as of January 1, 2022          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use asset   212,000      
Property, Plant and Equipment, Net   252,000      
Total assets   19,693,000      
Operating lease liabilities, current   148,000      
Operating lease liabilities, non-current   179,000      
Total liabilities   3,283,000      
Accumulated deficit   (212,170,000)      
Total stockholders' equity   16,410,000      
Total liabilities and stockholders' equity   19,693,000      
Accounting Standards Update 2016-02 Leases | Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use asset   212,000      
Property, Plant and Equipment, Net 90,000 90,000      
Total assets   302,000      
Operating lease liabilities, current   148,000      
Operating lease liabilities, non-current   179,000      
Deferred rent $ 58,000 (58,000)      
Total liabilities   269,000      
Accumulated deficit   33,000      
Total stockholders' equity   33,000      
Total liabilities and stockholders' equity   $ 302,000      
[1] The condensed consolidated balance sheet as of December 31, 2021 was derived from the audited consolidated balance sheet as of that date.