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Notes Payable (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Number of shares of common stock called by issuance of warrants 5,500,000 4,200,000    
Aggregate exercise price of common stock called by issuance of warrants $ 2.63      
Warrants outstanding   0    
Cash and cash equivalent minimum amount quarterly required   $ 2,000,000    
Future cash flows weighted average market yield   10.60% 13.50%  
Fair value of the financing derivative   $ 356,000 $ 600,000 $ 944,000
Fair value of the warrants $ 6,400,000      
Notes [Member]        
Debt Instrument [Line Items]        
Principal amount of notes 14,100,000      
Percentage of net proceeds from out side financing or equity component   25.00%    
Percentage of principal amount repaid   100.00%    
Carrying value of the notes 12,800,000      
Original issue discount $ 7,700,000      
Debt discount that has yet to be amortized   $ 4,300,000 $ 5,400,000  
Maturity date Feb. 29, 2020      
Deerfield promissory notes [Member]        
Debt Instrument [Line Items]        
Principal amount of notes $ 20,500,000      
Debt instrument, stated interest rate 8.75%      
Proceeds from issuance of debt $ 20,500,000