Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficiency) (USD $) In Thousands, except Share data	Total	Preferred Stock [Member]	Preferred Stock [Member] Series D Convertible Preferred Stock [Member]	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2012	$ (37,448)	$ 37,959		$ 4		$ 2,826		$ (40,278)
Beginning Balance, Shares at Dec. 31, 2012		14,856,481		3,848,293
Exercise of warrants to purchase Series D convertible preferred stock			5,816
Exercise of warrants to purchase Series D convertible preferred stock, Shares			225,660
Stock-based compensation expense	1,788					1,788
Exercise of stock options	127					127
Exercise of stock options, Shares				105,021
Net loss	(7,475)							(7,475)
Ending Balance at Dec. 31, 2013	(43,008)	43,775		4		4,741		(47,753)
Ending Balance, Shares at Dec. 31, 2013		15,082,141		3,953,314
Conversion of warrants to purchase common stock	2,866					2,866
Exercise of warrants to purchase common stock					[1]
Exercise of warrants to purchase common stock, Shares				107,217
Conversion of preferred stock to common stock upon initial public offering	43,775	(43,775)		15		43,760
Conversion of preferred stock to common stock upon initial public offering, Shares		(15,082,141)		15,082,141
Stock-based compensation expense	646					646
Exercise of stock options	13					13
Exercise of stock options, Shares	10,875			10,875
Issuance of common stock upon initial public offering, Value	106,071			5		106,066
Issuance of common stock upon initial public offering, Shares				5,300,436
Unrealized losses on derivative instruments	(22)						(22)
Net loss	(8,074)							(8,074)
Ending Balance at Mar. 31, 2014	$ 102,267			$ 24		$ 158,092	$ (22)	$ (55,827)
Ending Balance, Shares at Mar. 31, 2014				24,453,983

[1] Represents an amount lower than $ 1.