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Convertible Notes - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Principal value notes and related accrued interest converted to common stock       $ 0 $ 85,000  
Debt discount   $ 18,003,000   $ 18,003,000   $ 18,003,000
Expected term       5 years    
Derivative revaluation income   (87,000) $ 254,000 $ (266,000) (287,000)  
Warrants Issued With September 2016 Convertible Notes            
Debt Instrument [Line Items]            
Debt discount $ 9,600,000 9,598,000   9,598,000   9,598,000
Compounded Bifurcated Derivatives            
Debt Instrument [Line Items]            
Debt discount 1,300,000 1,267,000   1,267,000   1,267,000
Beneficial Conversion Feature            
Debt Instrument [Line Items]            
Debt discount $ 7,200,000 7,138,000   7,138,000   7,138,000
Warrants Issued With September 2016 Convertible Notes            
Debt Instrument [Line Items]            
Warrants issued to purchase common stock (in shares) | shares 1,205,840          
Convertible Debt            
Debt Instrument [Line Items]            
Convertible debt principal $ 18,087,500          
Interest rate 4.00%          
Additional amount over closing bid price (in usd per share) | $ / shares $ 0.12625          
Period after product candidate FCX-007 is approved to reach maturity 180 days          
Required written notice period prior to exercise of put right 180 days          
Prepayment as a percent of outstanding principal 101.00%          
Principal value notes and related accrued interest converted to common stock   0   0    
Debt discount $ 18,100,000          
Amortization of debt discount   0 36,000 0 86,000  
Convertible promissory notes   $ 18,003,000 $ 85,000 $ 18,003,000 $ 85,000 $ 18,003,000
Effective yield   1157.00%   1157.00%    
Convertible Debt | Minimum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) | $ / shares $ 17.04375          
Convertible Debt | Maximum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) | $ / shares $ 18.39375          
Dividend yield | Binomial Lattice Model | Compounded Bifurcated Derivatives            
Debt Instrument [Line Items]            
Derivative liability, measurement input   0   0   0