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Subsequent Events Subsequent Events (Details) - USD ($)
Feb. 23, 2018
Nov. 17, 2017
Sep. 13, 2013
Subsequent Event [Line Items]      
Share price (in dollars per share)     $ 1.23
Prepayment premium percentage   5.00%  
HCP-FVA, LLC | Finance Commitment Loan      
Subsequent Event [Line Items]      
Warrants reserved for purchase   $ 3,000,000  
HCP-FVA, LLC | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Total warrants (in shares) 30,000,000    
HCP-FVA, LLC | Loan and Security Agreement Short-term Loan      
Subsequent Event [Line Items]      
Principal amount borrowed   $ 500,000  
Potential warrants to purchase shares to be issued (in shares)   61,165,134  
Liquidity variance   10.00%  
HCP-FVA, LLC | Loan and Security Agreement Short-term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Percent of units required to be held 25.00%    
HCP-FVA, LLC | Amended and Restated Loan Agreement | Subsequent Event      
Subsequent Event [Line Items]      
Prepayment premium percentage 5.00%    
Restricted cash $ 2,000,000    
Term loan holding amount 50.00%    
Initial Backstop Warrant | HCP-FVA, LLC | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from warrants $ 3,000,000    
Initial Backstop Warrant | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan      
Subsequent Event [Line Items]      
Total warrants (in shares)   13,859,128  
Initial Backstop Warrant | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from warrants $ 2,500,000    
Additional Backstop Warrant | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan      
Subsequent Event [Line Items]      
Total warrants (in shares)   41,577,382  
Amount subject to cancellation   50.00%  
Additional Backstop Warrant | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Total warrants (in shares) 41,577,383    
Financing Warrants | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Total warrants (in shares) 366,990,000    
Accredited Investors | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Potential warrants to purchase shares to be issued (in shares) 40,000,000    
Warrants called by each unit (in shares) 12.233    
Total warrants (in shares) 489,320,000.00    
Preferred stock component (in shares) 0.0225    
Prime rate | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan      
Subsequent Event [Line Items]      
Debt rate basis spread   0.75%  
Secured Debt | Accredited Investors | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Senior debt component (USD per unit) $ 0.10    
Proceeds from issuance of senior secured debt $ 4,000,000    
Secured Debt | Prime rate | Accredited Investors | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Debt rate basis spread 0.75%    
Preferred Stock | Accredited Investors | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Share price (in dollars per share) $ 0.2643    
Common Stock | Additional Backstop Warrant | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan      
Subsequent Event [Line Items]      
Amount subject to cancellation   66.66%  
Eligible Stockholders | HCP-FVA, LLC | Finance Commitment Loan | Subsequent Event      
Subsequent Event [Line Items]      
Total warrants (in shares) 10,000,000    
Eligible Stockholders | HCP-FVA, LLC | Loan and Security Agreement Short-term Loan | Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from warrants $ 1,000,000    
Hale Capital | Financing and Backstop Warrants | Finance Commitment Loan      
Subsequent Event [Line Items]      
Potential ownership percentage   73.00%  
Ownership on converted basis   22.00%  
HCP-FVA, LLC | Financing and Backstop Warrants | Finance Commitment Loan      
Subsequent Event [Line Items]      
Subscription percentage   25.00%