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Net Loss Per Share - Antidilutive (Details) - shares
3 Months Ended 9 Months Ended
Jan. 20, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Securities excluded from computation of diluted net loss per share          
Anti-dilutive securities excluded from calculation of diluted net loss per share   1,917,137 3,544,519 1,917,137 3,544,519
Common Stock | Conversion of preferred stock into common stock          
Securities excluded from computation of diluted net loss per share          
Shares issued on conversion of preferred stock 3,174,523        
Common Stock | Conversion of notes payable - related party and accrued interest into common stock          
Securities excluded from computation of diluted net loss per share          
Shares issued on conversion of notes payable and related accrued interest 1,950,768        
Options to purchase common stock          
Securities excluded from computation of diluted net loss per share          
Anti-dilutive securities excluded from calculation of diluted net loss per share   1,862,621 53,228 1,862,621 53,228
Warrants assumed from Macrocure          
Securities excluded from computation of diluted net loss per share          
Anti-dilutive securities excluded from calculation of diluted net loss per share   54,516   54,516  
Convertible preferred stock and accrued dividends (as converted to common stock)          
Securities excluded from computation of diluted net loss per share          
Anti-dilutive securities excluded from calculation of diluted net loss per share     3,491,291   3,491,291