Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficiency) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]		Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2013	15,082,141	3,953,314
Balance at Dec. 31, 2013	$ 43,775	$ 4		$ 4,741		$ (47,753)	$ (43,008)
Common stock issued (in shares)		5,300,436
Common stock issued		$ 5		106,066			106,071
Conversion of preferred stock to common stock upon initial public offering (in shares)	(15,082,141)	15,082,141
Conversion of preferred stock to common stock upon initial public offering	$ (43,775)	$ 15		43,760			43,775
Conversion of warrants to purchase preferred stock into warrants to purchase common stock				2,866			2,866
Exercise of warrants to purchase common stock (in shares)		107,217
Stock-based compensation expense				4,664			$ 4,664
Exercise of stock options (in shares)		238,951					213,174
Exercise of stock options			[1]	381			$ 382
Exercise of restricted stock units (in shares)		3,545
Unrealized losses on derivative instruments					(326)		(326)
Net loss						(19,398)	(19,398)
Balance (in shares) at Dec. 31, 2014		24,685,604
Balance at Dec. 31, 2014		$ 25		162,478	(326)	(67,151)	$ 95,026
Exercise of stock options (in shares)		238,951					213,174
Exercise of stock options			[1]	381			$ 382
Unrealized loss on derivative instruments					(326)		(326)
Stock-based compensation expense				7,794			$ 7,794
Exercise of stock options (in shares)		1,350,162					1,334,351
Exercise of stock options				2,054			$ 2,055
Unrealized losses on derivative instruments					(5)		(5)
Net loss						(21,283)	(21,283)
Balance (in shares) at Dec. 31, 2015		26,069,154
Balance at Dec. 31, 2015		$ 26		172,326	(331)	(88,434)	$ 83,587
Exercise of stock options (in shares)		1,350,162					1,334,351
Exercise of stock options				2,054			$ 2,055
Exercise of restricted stock units (in shares)		33,388
Unrealized loss on derivative instruments					(5)		(5)
Common stock issued (in shares)		752,608
Common stock issued				4,071			4,072
Stock-based compensation expense				12,938			$ 12,938
Exercise of stock options (in shares)							445,535
Unrealized losses on derivative instruments					(148)		$ (148)
Net loss						(17,710)	(17,710)
Balance (in shares) at Dec. 31, 2016		26,821,762
Balance at Dec. 31, 2016		$ 27		$ 189,335	(479)	$ (106,144)	$ 82,739
Exercise of stock options (in shares)							445,535
Unrealized loss on derivative instruments					$ (148)		$ (148)

[1] Represents an amount lower than $ 1.