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Fair Value Measurements - Schedule of Changes in Level 3 Liabilities Measured at Fair Value (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Beginning balance     $ 23,231,938 $ 3,794,153 $ 3,794,153
Conversion of warrant liabilities     (51,325,017)      
Fair value adjustments for warrant liabilities     40,338,368      
Cashless warrants exercise related to derivative liability     (11,638,566)      
Loss on issuance of Preferred C 2,809,497    
Net proceeds from May fund raising     925,114    
Change in fair value of derivative liability         (5,921,409) (482,666)
Reclassification of derivative liability         92,601  
Fair value of warrant liability associated with convertible notes         25,266,593  
Ending balance $ 4,341,334   $ 4,341,334   $ 23,231,938 3,794,153
January 19, 2015 [Member]            
Fair value of derivative liability on date of issuance           952,600
April 20, 2015 [Member]            
Fair value of derivative liability on date of issuance           2,843,811
April 20, 2015 [Member]            
Fair value of derivative liability on date of issuance           537,152
October 15, 2015 [Member]            
Cashless warrants exercise related to derivative liability           $ (56,744)