Net Loss Per Share - Antidilutive (Details) - shares		12 Months Ended
	Jan. 20, 2017	Dec. 31, 2017	Dec. 31, 2016
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share		2,312,137	3,326,736
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
Stock Options
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share		2,257,621	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
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			3,273,508