Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficiency) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Issuance costs, net	$ 2,376
Exercise of stock options	13	127
Exercise of warrants to purchase common stock
Maximum [Member]
Exercise of stock options	1	1
Exercise of warrants to purchase common stock	$ 1