Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Number of outstanding ordinary shares	Additional paid-in capital	Treasury shares	Accumulated other comprehensive loss		Accumulated deficit	Total
Balance beginning at Dec. 31, 2017	$ 2,097	$ 244,609	$ (3,312)	$ (1,195)	[1]	$ (195,098)	$ 471,010
Balance beginning, shares at Dec. 31, 2017	52,375,854
Issuance of treasury shares upon exercise of options and vesting of restricted share units		(479)	2,314		[1]	(442)	1,393
Issuance of treasury shares upon exercise of options and vesting of restricted share units, shares	681,354
Stock-based compensation related to employees, directors and consultants		1,440			[1]		1,440
Stock-based compensation related to employees, directors and consultants		2,060			[1]		2,060
Other comprehensive loss				(471)	[1]		(471)
Cumulative effect of adopting ASC 606						1,811	1,811
Loss					[1]	(19,414)	(19,414)
Balance ending at Dec. 31, 2018	$ 2,097	245,570	(998)	(1,666)	[1]	(213,143)	31,860
Balance ending, shares at Dec. 31, 2018	54,057,208
Issuance of treasury shares upon exercise of options and vesting of restricted share units		(403)	998		[1]	(168)	427
Issuance of treasury shares upon exercise of options and vesting of restricted share units, shares	348,673
Issuance of ordinary shares upon exercise of option	$ 10	306			[1]		316
Issuance of ordinary shares upon exercise of option, shares	248,226
Payment of interest in shares	$ 3	$ 140			[1]		$ 143
Payment of interest in shares, shares	82,482
Issuance of ordinary shares upon rights offering	199	7,768			[1]		7,967
Issuance of ordinary shares upon rights offering, shares	4,635,584
Stock-based compensation related to employees, directors and consultants		$ 2,360			[1]		$ 2,360
Other comprehensive loss				(344)	[1]		(344)
Loss					[1]	(18,018)	(18,018)
Balance ending at Dec. 31, 2019	$ 2,309	$ 255,741		$ (2,010)	[1]	$ (231,329)	$ 24,711
Balance ending, shares at Dec. 31, 2019	59,372,173

[1] Relates to foreign currency translation adjustments.