Share Capital - Schedule of Warrants to Purchase Ordinary Shares that were Issued to Purchase of Convertible Preferred Shares (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Class Of Warrant Or Right [Line Items]
Warrants for ordinary shares	508,104	1,933,313
Exercise price per share	$ 3.59	$ 3.59
July 31, 2017
Class Of Warrant Or Right [Line Items]
Expiration date	Jul. 31, 2017
Warrants for ordinary shares		547,478
Exercise price per share	$ 3.59
January 22, 2018
Class Of Warrant Or Right [Line Items]
Expiration date	Jan. 22, 2018
Warrants for ordinary shares	203,241	554,331
Exercise price per share	$ 3.59
July 21, 2018
Class Of Warrant Or Right [Line Items]
Expiration date	Jul. 21, 2018
Warrants for ordinary shares	304,863	831,504
Exercise price per share	$ 3.59