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Convertible Notes (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]        
Debt issuance costs     $ (265,000)  
Convertible notes payable, net $ 0 $ 15,256,000    
Convertible Debt        
Debt Instrument [Line Items]        
Face amount 0 15,000,000    
Front end fees 0 (75,000)   $ (450,000)
Debt issuance costs 0 (44,000)    
Back end fees 0 375,000    
Convertible notes payable, net $ 0 $ 15,256,000