Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.20.4
Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 05, 2018
Aug. 29, 2015
Summary of Significant Accounting Policies [Line Items]          
Depreciation, Depletion and Amortization $ 201,000 $ 240,000      
Cash and Cash Equivalents, at Carrying Value. $ 6,227,000 15,045,000 $ 28,918,000    
Equity Method Investment, Ownership Percentage 83.00%        
Accrued Liabilities $ 700,000 700,000      
Prepaid Expense 470,000 48,000      
preferred stock accrued dividends 254,000 248,000      
Net Loss Attributable to Non-controlling Interest $ (73,000) $ (77,000)      
Preferred Stock Shares Converted 3,665 1,523      
Right of use asset $ 279,000 $ 419,000      
Operating Lease Liability 287,000 249,000      
Series A and Series B Preferred Stock [Member]          
Summary of Significant Accounting Policies [Line Items]          
Net Loss Attributable to Non-controlling Interest $ 100,000 $ 100,000      
Series B Preferred Stock [Member]          
Summary of Significant Accounting Policies [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,454,783 6,641,736      
preferred stock accrued dividends $ 1,380,000 $ 525,000      
Net Loss Attributable to Non-controlling Interest 0 0      
Accretion of preferred discount $ 1,400,000 $ 525,000      
Series A Preferred Stock [Member]          
Summary of Significant Accounting Policies [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 678,258 664,798      
preferred stock accrued dividends $ 254,000 $ 248,000      
Accretion of preferred discount     $ 6,900,000    
Warrant [Member]          
Summary of Significant Accounting Policies [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 18,000,713 18,714,999      
Options [Member]          
Summary of Significant Accounting Policies [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,997,418 2,502,012      
Money Market Accounts [Member]          
Summary of Significant Accounting Policies [Line Items]          
Cash and Cash Equivalents, at Carrying Value. $ 114,000 $ 98,000      
SYN Biomics [Member]          
Summary of Significant Accounting Policies [Line Items]          
Equity Method Investment, Ownership Percentage 83.00%     88.50%  
Noncontrolling Interest, Ownership Percentage by Parent 17.00%     11.50% 8.50%
Net Loss Attributable to Non-controlling Interest $ 2,800,000 $ 2,900,000