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Notes Payable (Narrative) (Details) - USD ($)
 1 Months Ended 9 Months Ended
Jun. 23, 2017
Feb. 28, 2013
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Debt Instrument [Line Items]              
Principal amount of notes   $ 20,500,000          
Number of shares of common stock called by issuance of warrants   5,500,000   4,200,000     3,818,000
Aggregate exercise price of common stock called by issuance of warrants   $ 2.63          
Warrants outstanding       0 0 0  
Repayment of notes payable     $ 4,500,000        
Future cash flows weighted average market yield     10.40% 10.60%      
Fair value of the financing derivative     $ 170,000 $ 356,000      
Fair value of the warrants   $ 6,400,000          
Notes payable, current     2,907,000        
Notes [Member]              
Debt Instrument [Line Items]              
Repayment of notes payable $ 4,500,000            
Fair value of the notes   $ 14,100,000          
Aggregate principal amount     16,000,000 20,500,000      
Debt discount that has yet to be amortized     $ 2,600,000 $ 4,300,000      
Maturity date     Feb. 01, 2020        
Deerfield promissory notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   8.75%          
Facility agreement period   7 years          
Percentage of net proceeds from out side financing or equity component   25.00%          
Cash and cash equivalent minimum amount quarterly required   $ 2,000,000          
Percentage of principal amount repaid   100.00%          
Proceeds from issuance of debt   $ 20,500,000          
Carrying value of the notes   12,800,000          
Original issue discount   $ 7,700,000          
Notes payable, current     $ 2,900,000