Nature of Business, Basis of Presentation and Liquidity - Private Placement of Common Stock (Details) - Private placement - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 14, 2017	Dec. 31, 2017
Private Placement of Common Stock
Number of warrants issued per common stock	1
Gross proceeds		$ 5,429
Common Stock
Private Placement of Common Stock
Issuance of stock (in shares)	2,958,094	2,958,094
Price per share (in dollars per share)	$ 6.085
Gross proceeds	$ 18,000	$ 3
Warrant Liability
Private Placement of Common Stock
Exercise price of warrant	$ 6.085
Exercise expiring period	7 years