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Convertible Notes - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Principal value notes and related accrued interest converted to common stock       $ 85,000 $ 0  
Debt discount   $ 18,003,000   $ 18,003,000   $ 18,088,000
Expected term       5 years    
Amortization of debt discount       $ 86,000 0  
Derivative revaluation income (expense)   (254,000) $ (251,000) 287,000 (251,000)  
Compounded Bifurcated Derivatives            
Debt Instrument [Line Items]            
Debt discount $ 1,300,000 1,267,000 1,300,000 1,267,000 1,300,000 1,273,000
Warrants Issued With September 2016 Convertible Notes            
Debt Instrument [Line Items]            
Debt discount 9,600,000 9,599,000 9,600,000 9,599,000 9,600,000 9,643,000
Beneficial Conversion Feature            
Debt Instrument [Line Items]            
Debt discount $ 7,200,000 7,137,000 $ 7,200,000 7,137,000 $ 7,200,000 $ 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   6,029,174   6,029,174  
Convertible Debt            
Debt Instrument [Line Items]            
Convertible debt principal $ 18,087,500   $ 18,087,500   $ 18,087,500  
Interest rate 4.00%   4.00%   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%   101.00%   101.00%  
Principal value notes and related accrued interest converted to common stock   85,000   85,000    
Debt discount $ 18,100,000   $ 18,100,000   $ 18,100,000  
Amortization of debt discount   $ 86,000   $ 86,000    
Effective yield   1157.00%   1157.00%    
Convertible Debt | Minimum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 3.40875   $ 3.40875   $ 3.40875  
Convertible Debt | Maximum            
Debt Instrument [Line Items]            
Conversion price (in dollars per share) $ 3.67875   $ 3.67875   $ 3.67875  
Common Stock            
Debt Instrument [Line Items]            
Principal value notes converted to common stock (in shares)       24,911