Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity (Tables) [Line Items]

Schedule of warrants and options exercise prices and expiration dates

	Exercise Price			Number of Shares		Expiration Date	Warrants or Options
	US$
To non-employees
		0.01			10,000	October 01, 2027	Options
		0.01			7,500	January 01, 2028	Options
		0.01			30,000	February 28, 2028	Options
		0.01			80,000	November 18, 2029	Options
		0.16			75,000	December 10, 2029	Options
		1.67			105,000	October 01, 2024	Options
		1.70			115,000	December 20, 2022	Options
To employees and directors
		0.01			10,000	November 11, 2023	Options
		0.01			5,000	June 11, 2024	Options
		0.01			20,000	June 05, 2026	Options
		0.01			130,000	January 01, 2027	Options
		0.01			50,000	January 04, 2027	Options
		0.01			60,000	April 17, 2027	Options
		0.01			200,000	May 21, 2027	Options
		0.01			30,000	October 01, 2027	Options
		0.01			77,500	January 01, 2028	Options
		0.01			25,000	January 04, 2028	Options
		0.01			4,000	April 06, 2028	Options
		0.01			25,000	January 6, 2029	Options
		0.01			75,000	January 4, 2031	Options
		0.01			10,000	September 01, 2031	Options
		0.01			85,000	September 18, 2029	Options
		0.01			125,000	November 18, 2029	Options
		0.01			35,000	January 05, 2030	Options
		0.01			10,000	September 02, 2030	Options
		0.01			200,000	May 21, 2031	Options
		0.01			355,000	July 17, 2031	Options
		0.16			340,000	December 10, 2025	Options
		0.18			25,000	December 02, 2025	Options
		0.25			413,000	September 1, 2031	Options
		0.28			25,000	September 03, 2025	Options
		0.28			25,000	September 03, 2029	Options
		0.29			25,000	June 15, 2027	Options
		0.39			1,510,000	July 9, 2031	Options
		0.59			1,400,000	May 21, 2027	Options
		0.59			1,800,000	May 21, 2031	Options
		0.92			350,000	January 4, 2027	Options
		0.92			600,000	January 4, 2031	Options
		1.33			25,000	May 01, 2023	Options
		1.38			105,307	January 02, 2025	Options
		1.55			200,000	June 05, 2022	Options
		1.67			300,943	October 01, 2024	Options
		1.70			103,500	December 20, 2022	Options
		1.75			250,000	June 07, 2023	Options
		1.78			25,000	September 04, 2024	Options
		2.31			250,000	January 01, 2024	Options
		4.15			25,000	July 02, 2024	Options
To investors
		0.01			431,655	February 25, 2023	Warrants
		0.25			174,970	June 12, 2023	Warrants
		0.25			439,916	June 2, 2022	Warrants
		0.25			1,020,000	June 23, 2022	Warrants
		1.00			243,853	May 02, 2023	Warrants
		1.00			545,900	October 29, 2023	Warrants
		1.00			2,144,099	March 03, 2023	Warrants
		1.00			359,435	August 14, 2023	Warrants
		1.00			4,376,000	July 15, 2022	Warrants
		1.00			267,660	July 15, 2022	Warrants
		1.00			240,068	January 08, 2023	Warrants
		2.00			1,498,804	January 31, 2023	Warrants
		2.00			517,875	August 25, 2023	Warrants
		3.00			640,730	June 29, 2023	Warrants
		5.00			372,400	April 19, 2023	Warrants
Total outstanding		0.98	*		23,015,115

Schedule of stock option transactions

	Number of shares			Weighted Average exercise price
				US$
Outstanding, December 31, 2019		5,195,250			1.12
Changes during 2020 to:
Granted to employees, officers, directors and others		120,000			0.01
Expired/Cancelled/Forfeited		(865,000	)		1.74
Exercised		(652,500	)		0.01
Outstanding, December 31, 2020		3,797,750			1.14
Changes during 2021 to:
Granted to employees, officers, directors and others*		7,023,000			0.49
Expired/Cancelled/Forfeited		(654,500	)		2.30
Exercised		(424,500	)		0.05
Outstanding, December 31, 2021		9,741,750			0.64
Exercisable, December 31, 2021		9,741,750			0.64

Schedule of stock options outstanding

Shares underlying outstanding options (non-vested)								Shares underlying outstanding options (fully vested)
Range of exercise price		Number outstanding		Weighted average remaining contractual life (years)		Weighted Average Exercise price		Range of exercise price		Number Outstanding		Weighted average remaining contractual life (years)		Weighted Average Exercise price
US$						US$		US$						US$
	—		—		—		—		0.01		10,000		1.86		0.01
	—		—		—		—		0.01		5,000		2.45		0.01
	—		—		—		—		0.01		20,000		4.42		0.01
	—		—		—		—		0.01		130,000		5.00		0.01
	—		—		—		—		0.01		50,000		5.00		0.01
	—		—		—		—		0.01		60,000		5.29		0.01
	—		—		—		—		0.01		200,000		5.38		0.01
	—		—		—		—		0.01		40,000		5.74		0.01
	—		—		—		—		0.01		85,000		6.00		0.01
	—		—		—		—		0.01		25,000		6.00		0.01
	—		—		—		—		0.01		30,000		6.15		0.01
	—		—		—		—		0.01		4,000		6.26		0.01
	—		—		—		—		0.01		25,000		7.01		0.01
	—		—		—		—		0.01		85,000		7.71		0.01
	—		—		—		—		0.01		205,000		7.88		0.01
	—		—		—		—		0.01		35,000		8.01		0.01
	—		—		—		—		0.01		75,000		9.01		0.01
	—		—		—		—		0.01		200,000		9.38		0.01
	—		—		—		—		0.01		355,000		9.54		0.01
	—		—		—		—		0.01		10,000		9.66		0.01
	—		—		—		—		0.16		340,000		3.94		0.16
	—		—		—		—		0.16		75,000		7.94		0.16
	—		—		—		—		0.18		25,000		3.91		0.18
	—		—		—		—		0.25		50,000		9.66		0.25
	—		—		—		—		0.25		363,000		9.66		0.25
	—		—		—		—		0.28		25,000		3.67		0.28
	—		—		—		—		0.28		25,000		7.67		0.28
	—		—		—		—		0.29		25,000		5.45		0.29
	—		—		—		—		0.39		1,510,000		9.82		0.39
	—		—		—		—		0.59		1,400,000		5.38		0.59
	—		—		—		—		0.59		1,800,000		9.38		0.59
	—		—		—		—		0.92		350,000		5.00		0.92
	—		—		—		—		0.92		600,000		9.01		0.92
	—		—		—		—		1.33		25,000		1.32		1.33
	—		—		—		—		1.38		105,307		3.01		1.38
	—		—		—		—		1.55		200,000		0.43		1.55
	—		—		—		—		1.67		405,943		2.75		1.67
	—		—		—		—		1.70		218,500		0.97		1.70
	—		—		—		—		1.75		250,000		1.51		1.75
	—		—		—		—		1.78		25,000		2.68		1.78
	—		—		—		—		2.31		250,000		2.00		2.31
	—		—		—		—		4.15		25,000		2.50		4.15
									0.01-4.15		9,741,750				0.64

Schedule of compensation cost of warrant and option issuance

For the year ended December 31,
2021	2020
US$ thousands	US$ thousands
3,217	59

For the year ended December 31,
2021	2020
US$ thousands	US$ thousands
102	—

For the year ended December 31,
2021	2020
US$ thousands	US$ thousands
—	—

Schedule of warrants description

		Period of Grant	US$		Expiration Date
ZNWAA Warrants	B,C	March 2013 – December 2014		2.00	January 31, 2023
ZNWAD Warrants	A,B,C	January 2015 – March 2016		1.00	May 02, 2023
ZNWAE Warrants	B,C	November 2016 – March 2017		1.00	May 01, 2023
ZNWAF Warrants	A,B,C	May 2017 – July 2017		1.00	August 14, 2023
ZNWAG Warrants	C	October 2017 – December 2017		1.00	January 08, 2023
ZNWAH Warrants	A,B,C	February 2018		5.00	April 2, 2023
ZNWAI Warrants	A,B,C	April 2018 – May 2018		3.00	June 29, 2023
ZNWAJ Warrants	B,C	August 2018 – September 2018		1.00	October 29, 2023
ZNWAK Warrants	B,C	December 2018 – January 2019		0.01	February 25, 2023
ZNWAL Warrants	C	July 2019 – August 2019		2.00	August 26, 2023
ZNWAM Warrants		January 2021 – March 2021		1.00	July 15, 2022
ZNWAN Warrants		May – June 2021		1.00	July 15, 2022
ZNWAO Warrants		June 2021		0.25	June 12, 2023
ZNWAP Warrants		June 2021		0.25	June 02, 2022
ZNWAQ Warrants		June 2021		0.25	July 6, 2022
ZNWAR Warrants		June 2021		0.25	June 22, 2022

Dividend Reinvestment And Stock Purchase Plan [Member]

Stockholders' Equity (Tables) [Line Items]

Schedule of warrants description

Warrants	Exercise Price		Warrant Termination Date	Outstanding Balance, 12/31/2019	Warrants Issued		Warrants Exercised			Warrants Expired		Outstanding Balance, 12/31/2020
ZNWAA	$	2.00	01/31/2023	1,498,804		-		-			-		1,498,804
ZNWAD	$	1.00	05/02/2023	243,853		-		-			-		243,853
ZNWAE	$	1.00	05/01/2023	2,144,470		-		(371	)		-		2,144,099
ZNWAF	$	1.00	08/14/2023	359,585		-		(150	)		-		359,435
ZNWAG	$	1.00	01/08/2023	240,578		-		(510	)		-		240,068
ZNWAH	$	5.00	04/19/2023	372,400		-		-			-		372,400
ZNWAI	$	3.00	06/29/2023	640,730		-		-			-		640,730
ZNWAJ	$	1.00	10/29/2023	546,000		-		(100	)		-		545,900
ZNWAK	$	0.01	02/25/2023	457,725		-		(19,850	)		-		437,875
ZNWAL	$	2.00	08/26/2023	517,925		-		(50	)		-		517,875
Outstanding warrants				7,022,070		-		(21,031	)		-		7,001,039

Warrants	Exercise Price		Warrant Termination Date	Outstanding Balance, 12/31/2020	Warrants Issued		Warrants Exercised			Warrants Expired		Outstanding Balance, 12/31/2021
ZNWAA	$	2.00	01/31/2023	1,498,804		-		-			-		1,498,804
ZNWAD	$	1.00	05/02/2023	243,853		-		-			-		243,853
ZNWAE	$	1.00	05/01/2023	2,144,099		-		-			-		2,144,099
ZNWAF	$	1.00	08/14/2023	359,435		-		-			-		359,435
ZNWAG	$	1.00	01/08/2023	240,068		-		-			-		240,068
ZNWAH	$	5.00	04/19/2023	372,400		-		-			-		372,400
ZNWAI	$	3.00	06/29/2023	640,730		-		-			-		640,730
ZNWAJ	$	1.00	10/29/2023	545,900		-		-			-		545,900
ZNWAK	$	0.01	02/25/2023	437,875		-		(6,220	)		-		431,655
ZNWAL	$	2.00	08/26/2023	517,875		-		-			-		517,875
ZNWAM	$	1.00	07/15/2022	-		4,376,000		-			-		4,376,000
ZNWAN	$	1.00	07/15/2022	-		267,785		(125	)		-		267,660
ZNWAO	$	0.25	06/12/2023	-		190,480		(15,510	)		-		174,970
ZNWAP	$	0.25	06/02/2022	-		1,639,916		(1,200,000	)		-		439,916
ZNWAR	$	0.25	06/23/2022	-		1,020,000		-			-		1,020,000
Outstanding warrants				7,001,039		7,494,181		(1,221,855	)		-		13,273,365

Employees [Member]

Stockholders' Equity (Tables) [Line Items]

Schedule of assumptions used to estimate fair value of warrants granted using black-scholes option pricing model

	For the year ended December 31,
	2021		2020
Weighted-average fair value of underlying stock at grant date	$	0.56	$	0.50
Dividend yields		—		—
Expected volatility		121%-143%		90%-103%
Risk-free interest rates		0.16%-0.85%		0.26%-1.61%
Expected life (in years)		3.00-5.00		5.00
Weighted-average grant date fair value	$	0.47	$	0.49

	For the year ended December 31,
	2021		2020
Weighted-average fair value of underlying stock at grant date	$	0.58	$	—
Dividend yields		—		—
Expected volatility		100%-113%		—
Risk-free interest rates		1.07%-1.42%		—
Expected life (in years)		6.00-10.00		—
Weighted-average grant date fair value	$	0.49	$	—