Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified	Ordinary Shares	Additional paid-in capital	Accumulated deficit	Total
Balance, beginning at Dec. 31, 2014	$ 2	$ 2,007	$ (38,330)	$ (36,321)
Balance, beginning (in shares) at Dec. 31, 2014	502,224
Increase (decrease) in Stockholders' Equity
Exercise of options into Ordinary Shares		145		145
Exercise of options into Ordinary Shares (in shares)	51,716
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 Ordinary Shares	2	5,943		5,945
Conversion of warrants to purchase Convertible Preferred Shares into Ordinary Shares (in shares)	697,443			697,443
Conversion of warrants to purchase Convertible Preferred Shares into warrants to purchase Ordinary Shares		87		87
Issuance of Ordinary Shares, net of issuance costs of $5,163, upon IPO	12	34,775		34,787
Issuance of Ordinary Shares, upon IPO (in shares)	4,700,000
Stock-based compensation		91		91
Net loss			(5,556)	(5,556)
Balance, ending at Mar. 31, 2015	$ 34	$ 90,105	$ (43,886)	$ 46,253
Balance, ending (in shares) at Mar. 31, 2015	13,415,703