Warrants (Tables)

6 Months Ended

Jun. 30, 2021

Warrants At Fair Value Of Explanatory [Abstract]

Schedule of warrants valuation assumptions of investors' warrants

	June 30,						December 31,
	2021			2020			2020
Risk-free interest rate (1)		0.10-0.11	%		0.15-0.16	%		0.12	%
Expected volatility (2)		65.44-70.62	%		75.01-75.66	%		68.59-69.23	%
Contractual term life (in years) (3)		1.13-1.18			2.13-2.18			1.63-1.68
Dividend yield (4)		0	%		0	%		0	%

(1)	Risk-free interest rate - based on yield rates of non-index linked U.S. Federal Reserve treasury bonds.
(2)	Expected volatility - was calculated based on actual historical share price movements of the Company over a term that is equivalent to the contractual term of the option.
(3)	Expected life - the expected life was based on the expiration date of the warrants.
(4)	Dividend yield - was based on the fact that the Company has not paid dividends to its shareholders in the past and does not expect to pay dividends to its shareholders in the future.

Schedule of outstanding warrants

Warrants outstanding to purchase ADSs		Number of shares exercisable		Issuance date	Exercise price in USD (per warrant)		Expiration date
	650,000		65,000,000	February 17, 2017		4.1	August 16, 2022
	1,365,000		136,500,000	March 7, 2017		2.3	September 6, 2022
	2,015,000		201,500,000