Warrants (Tables)

12 Months Ended

Dec. 31, 2021

Warrants At Fair Value Of Explanatory [Abstract]

Schedule of warrants valuation assumptions of investors' warrants

	December 31,
	2021			2020			2019
Risk-free interest rate (1)		0.19	%		0.12	%		1.6	%
Expected volatility (2)		60.83-62.46	%		68.59-69.23	%		52.53-52.62	%
Contractual term life (in years) (3)		0.63-0.68			1.63-1.68			2.63-2.68
Dividend yield (4)		0	%		0	%		0	%

Schedule of the outstanding warrants

Warrants outstanding to purchase ADSs		Number of shares exercisable		Issuance date	Value in USD (per warrant)		Exercise price in USD (per warrant)		Expiration date
	650,000		65,000,000	February 17, 2017		0.2		4.1	5,000,000 on February 12, 2022 and 60,000,000 on August 16, 2022
	1,197,500		119,750,000	March 7, 2017		0.77		2.3	September 6, 2022
	1,847,500		184,750,000

Schedule of warrant exercises

	Warrants issued February 17, 2017					Warrants issued March 7, 2017
	Number of warrants			Value in USD (per warrant)		Number of warrants			Value in USD (per warrant)
Outstanding at January 1, 2021		1,050,000			0.75		1,400,000			1.32
Exercised		(400,000	)		1.14		(202,500	)		1.59 - 2.94
Outstanding at December 31, 2021		650,000			0.2		1,197,500			0.77