SHAREHOLDERS' EQUITY DEFICIT - Share capital additional disclosures (Details) $ / shares in Units, $ in Thousands					3 Months Ended
	Apr. 22, 2015 USD ($) shares	Mar. 25, 2015 USD ($) $ / shares shares	Mar. 01, 2015 shares	Jan. 24, 2015 USD ($) $ / shares shares	Mar. 31, 2015 USD ($)	Mar. 31, 2016 shares	Dec. 31, 2015 shares	Feb. 28, 2015 shares
Shareholders' Deficit disclosures
Proceeds from issuance of convertible preferred shares					$ 11,406
Stock split ratio			7.75
Ordinary Shares, shares authorized | shares			50,000,000			50,000,000	50,000,000	5,000,000
IPO
Shareholders' Deficit disclosures
Price per share | $ / shares		$ 8.50
Proceeds from Issuance - Initial Public Offering		$ 40,000
Issuance of Ordinary Shares, upon IPO (in shares) | shares		4,700,000
Stock issuance costs		$ 5,200
Underwriters Over-Allotment Option
Shareholders' Deficit disclosures
Issuance of Ordinary Shares, net of underwriters' fees (in shares) | shares	165,452
Proceeds from issuance of Ordinary Shares, net of underwriters' fees	$ 1,308
Series E Preferred shares
Shareholders' Deficit disclosures
Proceeds from issuance of convertible preferred shares				$ 11,406
Convertible Preferred Stock issued (in shares) | shares				1,445,966
Price per share | $ / shares				$ 8.49