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Related Party Transactions (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
agreement
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
director
agreement
Jun. 30, 2016
USD ($)
Mar. 07, 2017
shares
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
shares
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Number of exclusive channel collaboration agreements (agreement) | agreement 2   2        
Royalty and milestone payments incurred     $ 0        
Research and development expense $ 1,679,000 $ 2,352,000 3,143,000 $ 4,954,000      
Related party payable 1,678,000   1,678,000     $ 942,000  
Warrants Issued With September 2016 Convertible Notes              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Warrants issued to purchase common stock (in shares) | shares             6,029,174
Convertible Debt              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Convertible debt principal             $ 18,087,500
Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Expenses for work performed 1,700,000 900,000          
Research and development expense 1,678,000 925,000 3,187,000 2,249,000      
Related party payable $ 1,700,000   $ 1,700,000     $ 900,000  
Shareholder ownership percentage of related party in affiliate, more than 50.00%   50.00%        
Shareholder ownership percentage 38.00%   38.00%        
Affiliated Entity | Private Placement              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Warrants issued to purchase common stock (in shares) | shares         1,295,875    
Preferred stock, shares issued (shares) | shares         3,016    
Affiliated Entity | Warrants Issued With September 2016 Convertible Notes              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Warrants issued to purchase common stock (in shares) | shares             2,254,168
Affiliated Entity | Convertible Debt              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Convertible debt principal             $ 6,762,500
Director              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Number of directors (director) | director     2        
2012 ECC | Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Expenses for work performed     $ 3,200,000 2,200,000      
2012 ECC Dispute | Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Research and development expense $ 1,100,000   800,000        
Related party payable 800,000   800,000        
2015 ECC | Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Expenses for work performed 0 0 0 0      
Direct Expenses for Work Performed | Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Expenses for work performed 300,000 300,000 600,000 800,000      
Pass-through Costs | Affiliated Entity              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Expenses for work performed $ 1,400,000 $ 600,000 $ 2,600,000 $ 1,400,000