STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Ordinary Shares	Additional paid-in capital	Accumulated deficit	Total
Balance, beginning at Dec. 31, 2013	$ 2	$ 1,773	$ (19,290)	$ (17,515)
Balance, beginning (in shares) at Dec. 31, 2013	501,828
Increase (decrease) in Stockholders' Equity
Exercise of options		1		1
Exercise of options (in shares)	396
Stock-based compensation		233		233
Net loss			(19,040)	(19,040)
Balance, ending at Dec. 31, 2014	$ 2	2,007	(38,330)	(36,321)
Balance, ending (in shares) at Dec. 31, 2014	502,224
Increase (decrease) in Stockholders' Equity
Exercise of options		145		145
Exercise of options (in shares)	56,366
Conversion of Convertible Preferred Shares into Ordinary Shares upon IPO	$ 18	47,057		47,075
Conversion of Convertible Preferred Shares into Ordinary Shares upon IPO (in shares)	7,464,320
Conversion of warrants to purchase Convertible Preferred Shares into warrants to purchase Ordinary Shares		87		87
Conversion of warrants to purchase Convertible Preferred Shares into Ordinary Shares	$ 2	5,943		5,945
Conversion of warrants to purchase Convertible Preferred Shares into Ordinary Shares (in shares)	697,448
Issuance of Ordinary Shares, net of issuance costs of $5,256, upon IPO	$ 12	34,684		34,696
Issuance of Ordinary Shares, upon IPO (in shares)	4,700,000
Issuance of Ordinary Shares, net of underwriters' fees of $98		1,308		1,308
Issuance of Ordinary Shares, net of underwriters' fees (in shares)	165,452
Stock-based compensation		583		583
Net loss			(24,971)	(24,971)
Balance, ending at Dec. 31, 2015	$ 34	$ 91,814	$ (63,301)	$ 28,547
Balance, ending (in shares) at Dec. 31, 2015	13,585,810