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Related Party Transactions Related Party Transactions (Detail Narrative) - USD ($)
Dec. 27, 2019
Oct. 09, 2018
Feb. 23, 2018
Dec. 31, 2020
Dec. 31, 2019
Nov. 17, 2017
Sep. 16, 2013
Related Party Transaction [Line Items]              
Series A redeemable convertible preferred stock, shares issued       900,000 900,000    
HCP-FVA, LLC [Member] | Finance Commitment Loan              
Related Party Transaction [Line Items]              
Total loan commitment amount available           $ 3,000,000  
Proceeds from issuance of long-term debt           3,000,000  
HCP-FVA, LLC [Member] | Commitment Loan [Member]              
Related Party Transaction [Line Items]              
Warrants issued (in shares)     30,000,000        
HCP-FVA, LLC [Member] | Loan and Security Agreement Short-term Loan              
Related Party Transaction [Line Items]              
Proceeds from issuance of long-term debt           $ 500,000  
Debt converted     $ 500,000        
New Investors [Member] | Financing Of Units [Member]              
Related Party Transaction [Line Items]              
Proceeds from issuance of long-term debt $ 1,000,000 $ 1,000,000          
Debt Instrument, Portion Of Debt Sold To New Lender   $ 520,000          
Various Lenders [Member] | 2019 Term Loan [Member]              
Related Party Transaction [Line Items]              
Proceeds from Lines of Credit $ 1,000,000            
Debt Instrument, Interest Rate, Stated Percentage 15.00%            
Initial Backstop Warrant | HCP-FVA, LLC [Member] | Finance Commitment Loan              
Related Party Transaction [Line Items]              
Proceeds from warrants     3,000,000        
Initial Backstop Warrant | HCP-FVA, LLC [Member] | Loan and Security Agreement Short-term Loan              
Related Party Transaction [Line Items]              
Warrants issued (in shares)           138,591  
Proceeds from warrants     $ 2,500,000        
Additional Backstop Warrant | HCP-FVA, LLC [Member] | Loan and Security Agreement Short-term Loan              
Related Party Transaction [Line Items]              
Warrants issued (in shares)     415,774        
Financing Warrants | HCP-FVA, LLC [Member] | Commitment Loan [Member]              
Related Party Transaction [Line Items]              
Class Of Warrant Of Right, Warrants Cancelled   636,109          
Financing Warrants | HCP-FVA, LLC [Member] | Loan and Security Agreement Short-term Loan              
Related Party Transaction [Line Items]              
Warrants issued (in shares)     3,669,900        
Financing Warrants | HCP-FVA, LLC [Member] | Financing Of Units [Member]              
Related Party Transaction [Line Items]              
Class of Warrant or Right, Outstanding   3,033,791          
Financing Warrants | New Investors [Member] | Financing Of Units [Member]              
Related Party Transaction [Line Items]              
Class of Warrant or Right, Outstanding   1,859,420          
Redeemable Convertible Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Series A redeemable convertible preferred stock, shares issued             900,000
Redeemable Convertible Preferred Stock [Member] | New Investors [Member]              
Related Party Transaction [Line Items]              
Series A redeemable convertible preferred stock, shares issued   342,000