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Notes Payable-Related Party (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 20, 2017
Jan. 13, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2014
Proceeds from promissory notes                
Proceeds from promissory notes         $ 750 $ 18,900    
Interest expense-related party       $ 380 121 722    
Conversion of notes payable - related party and accrued interest into common stock         31,145      
Common Stock                
Proceeds from promissory notes                
Conversion of notes payable - related party and accrued interest into common stock         2      
Conversion of notes payable - related party and accrued interest into common stock | Common Stock                
Proceeds from promissory notes                
Shares issued on conversion of notes payable and related accrued interest 1,950,768              
Convertible Promissory notes | Convertible promissory note executed with stockholder | Stockholder                
Proceeds from promissory notes                
Note interest rate (as a percent)               8.00%
Proceeds from promissory notes   $ 750         $ 25,900  
Promissory notes payable outstanding             29,000  
Accrued interest expense             $ 1,274  
Interest expense-related party     $ 0 $ 380 $ 121 $ 722    
Convertible Promissory notes | Convertible promissory note executed with stockholder | Stockholder | Conversion of notes payable - related party and accrued interest into common stock                
Proceeds from promissory notes                
Conversion of notes payable - related party and accrued interest into common stock $ 31,145