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Convertible Notes - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Debt discount   $ 18,003,000 $ 18,088,000
Amortization period 5 years    
Derivative liability revaluation expense   1,407,000 462,000
Compounded Bifurcated Derivatives      
Debt Instrument [Line Items]      
Debt discount $ 1,300,000 1,267,000 1,273,000
Issued with September 2016 Convertible Notes      
Debt Instrument [Line Items]      
Debt discount 9,600,000 9,598,000 9,643,000
Beneficial Conversion Feature      
Debt Instrument [Line Items]      
Debt discount $ 7,200,000 $ 7,138,000 7,172,000
Issued with September 2016 Convertible Notes      
Debt Instrument [Line Items]      
Warrants issued to purchase common stock (in shares) 6,029,174    
Convertible Debt      
Debt Instrument [Line Items]      
Convertible debt principal $ 18,087,500    
Interest rate 4.00%    
Period after product candidate FCX-007 is approved to reach maturity date 180 days 180 days  
Required written notice period prior to exercise of put right 180 days    
Prepayment as a percent of outstanding principal 101.00%    
Debt discount $ 18,100,000    
Amortization expense   $ 100,000 $ 0
Effective yield 1157.00%    
Convertible Debt | Option Two      
Debt Instrument [Line Items]      
Additional conversion price (usd per share)   $ 0.12625  
Convertible Debt | Option Two | Minimum      
Debt Instrument [Line Items]      
Conversion price (usd per share)   3.40875  
Convertible Debt | Option Two | Maximum      
Debt Instrument [Line Items]      
Conversion price (usd per share)   $ 3.67875