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Convertible Notes - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Debt discount   $ 18,038,000   $ 18,038,000   $ 18,088,000
Expected term       5 years    
Derivative revaluation income   853,000 $ 0 $ 541,000 $ 0  
Compounded Bifurcated Derivatives            
Debt Instrument [Line Items]            
Debt discount $ 1,300,000 1,269,000   1,269,000   1,273,000
Warrants Issued With September 2016 Convertible Notes            
Debt Instrument [Line Items]            
Debt discount 9,600,000 9,617,000   9,617,000   9,643,000
Beneficial Conversion Feature            
Debt Instrument [Line Items]            
Debt discount $ 7,200,000 7,152,000   7,152,000   $ 7,172,000
Warrants 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 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   50,000   50,000    
Debt discount $ 18,100,000          
Amortization of debt discount   $ 0   $ 0    
Effective yield   1157.00%   1157.00%    
Convertible Debt | Minimum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 3.40875          
Convertible Debt | Maximum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 3.67875          
Common Stock            
Debt Instrument [Line Items]            
Principal value notes converted to common stock (in shares)   14,895   14,895