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Convertible Promissory Notes - Related Parties (Details)
1 Months Ended 12 Months Ended
Apr. 13, 2016
USD ($)
Lender
$ / shares
Mar. 01, 2016
USD ($)
Sep. 16, 2011
Sep. 14, 2011
Jul. 30, 2015
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Interest rate         4.00%    
Preferred stock, par value (in dollars per share) | $ / shares           $ 0.0001 $ 0.0001
Cash received           $ 8,500,250 $ 2,800,000
Conversion amount           500,000  
Convertible Promissory Notes              
Total accrued and waived interest $ 13,680,000            
Accrued interest           $ 2,456,000  
Net waived interest recorded as an increase to APIC 11,224,000            
Conversion amount $ 500,000            
September 14, 2011 Notes              
Interest rate       8.00%      
Percentage of per share purchase price of third party led securities       80.00%      
Amended And Restated September 14, 2011 Notes              
Conversion ratio upon completion of merger 1.00            
September 16, 2011 Notes              
Interest rate (as a percent)     8.00%        
Percentage of per share purchase price of third party led securities     80.00%        
Percentage of original principal amount     10.00%        
Amended And Restated September 16, 2011 Notes              
Conversion ratio upon completion of merger 1.00            
March 1, 2016 Notes              
Interest rate (as a percent)   8.00%          
Maximum borrowing   $ 2,000,000          
Aggregate principal amount   $ 750,000          
Amended And Restated March 1, 2016 Notes              
Conversion ratio upon completion of merger 1.07581            
Maximum borrowing $ 9,000,000            
Number of additional lenders | Lender 2            
Purchase price per share, minimum multiplier under Qualified Financing | $ / shares $ 0.85            
Cash received $ 8,500,000            
Common stock | September 14, 2011 Notes              
Conversion ratio       14.29759      
Common stock | Amended And Restated September 14, 2011 Notes              
Conversion ratio 1.00            
Common stock | Amended And Restated September 16, 2011 Notes              
Conversion ratio 1.00            
Common stock | Amended And Restated March 1, 2016 Notes              
Conversion ratio 1.07581            
Series A Preferred Stock | September 16, 2011 Notes              
Conversion ratio     14.29759        
Series A Preferred Stock | Amended And Restated September 16, 2011 Notes              
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001            
Lender D | Amended And Restated March 1, 2016 Notes              
Conversion amount $ 500,000