Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Number of outstanding ordinary shares	Additional paid-in capital	Treasury shares	Accumulated other comprehensive income (loss)	[1]	Accumulated deficit	Total
Balance beginning at Dec. 31, 2018	$ 2,097	$ 245,570	$ (998)	$ (1,666)		$ (213,143)	$ 31,860
Balance beginning, shares at Dec. 31, 2018	54,057,208
Issuance of treasury shares upon exercise of options and vesting of restricted share units		(403)	998			(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 options and vesting		85					85
Issuance of ordinary shares upon exercise of options and vesting, shares	59,476
Payment of interest in shares	$ 1	70					71
Payment of interest in shares, shares	35,950
Stock-based compensation related to employees, directors and consultants		583					583
Other comprehensive loss				(96)			(96)
Loss						(9,149)	(9,149)
Balance ending at Jun. 30, 2019	$ 2,098	245,905		(1,762)		(222,460)	23,781
Balance ending, shares at Jun. 30, 2019	54,501,307
Balance beginning at Mar. 31, 2019	$ 2,097	245,527	(416)	(2,038)		(217,800)	27,370
Balance beginning, shares at Mar. 31, 2019	54,260,357
Issuance of treasury shares upon exercise of options and vesting of restricted share units		(91)	416			(87)	238
Issuance of treasury shares upon exercise of options and vesting of restricted share units, shares	145,524
Issuance of ordinary shares upon exercise of options and vesting		85					85
Issuance of ordinary shares upon exercise of options and vesting, shares	59,476
Payment of interest in shares	$ 1	70					71
Payment of interest in shares, shares	35,950
Stock-based compensation related to employees, directors and consultants		314					314
Other comprehensive loss				276			276
Loss						(4,573)	(4,573)
Balance ending at Jun. 30, 2019	$ 2,098	245,905		(1,762)		(222,460)	23,781
Balance ending, shares at Jun. 30, 2019	54,501,307
Balance beginning at Dec. 31, 2019	$ 2,309	255,741		(2,010)		(231,329)	24,711
Balance beginning, shares at Dec. 31, 2019	59,372,173
Restricted stock units vested	$ 28	(28)
Restricted stock units vested, shares	631,132
Payment of interest in shares	$ 5	138					143
Payment of interest in shares, shares	129,376
Stock-based compensation related to employees, directors and consultants		1,152					1,152
Issuance of shares upon early conversion of Convertible Debentures	$ 3	42					45
Issuance of shares upon early conversion of Convertible Debentures, shares	64,542
Other comprehensive loss				(1)			(1)
Loss						(7,365)	(7,365)
Balance ending at Jun. 30, 2020	$ 2,345	257,045		(2,011)		(238,694)	18,685
Balance ending, shares at Jun. 30, 2020	60,197,223
Balance beginning at Mar. 31, 2020	$ 2,335	256,360		(2,298)		(234,080)	22,317
Balance beginning, shares at Mar. 31, 2020	59,965,805
Restricted stock units vested	$ 2	(2)
Restricted stock units vested, shares	37,500
Payment of interest in shares	$ 5	138					143
Payment of interest in shares, shares	129,376
Stock-based compensation related to employees, directors and consultants		507					507
Issuance of shares upon early conversion of Convertible Debentures	$ 3	42					45
Issuance of shares upon early conversion of Convertible Debentures, shares	64,542
Other comprehensive loss				287			287
Loss						(4,614)	(4,614)
Balance ending at Jun. 30, 2020	$ 2,345	$ 257,045		$ (2,011)		$ (238,694)	$ 18,685
Balance ending, shares at Jun. 30, 2020	60,197,223

[1] Transactions with related parties are included in the line item above (refer to Footnote 8, Related Parties, of the Notes to Consolidated Financial Statements for additional information).