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Convertible Notes - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]            
Debt discount   $ 18,003,000   $ 18,003,000   $ 18,003,000
Expected term       5 years    
Derivative revaluation income   242,000 $ 853,000 $ 179,000 $ 541,000  
Compounded Bifurcated Derivatives            
Debt Instrument [Line Items]            
Debt discount $ 1,300,000 1,267,000   1,267,000   1,267,000
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
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) 1,205,840          
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   0   0    
Debt discount $ 18,100,000          
Amortization of debt discount   0 50,000 0 50,000  
Convertible promissory notes   $ 18,003,000 $ 50,000 $ 18,003,000 $ 50,000 $ 18,003,000
Effective yield   1157.00%   1157.00%    
Convertible Debt | Minimum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 17.04375          
Convertible Debt | Maximum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 18.39375