Stockholders Equity (Tables)

9 Months Ended

Sep. 30, 2021

Stockholders Equity (Tables) [Line Items]

Schedule of outstanding warrants to purchase Common Stock [issued to shareholders]

Warrant	Issuance Date	Expiration Date	Exercise Price Per Share		Number of Shares of Common Stock Underlying Warrants
Private Placement Warrants	IPO (December 13, 2018)	December 13, 2023		11.50		2,900,000
Public Warrants	IPO (December 13, 2018)	October 28, 2024		11.50		3,500,000
2021 Registered Direct Offering Warrants	SPA (July 28, 2021)	January 28, 2027		5.00		2,812,501
						9,212,501

Schedule of black-scholes option-pricing model

	Nine Months Ended September 30,
	2021		2020
Underlying value of Common Stock ($)		7.02		5.59-6.21
Exercise price ($)		7.02		5.59-6.21
Expected volatility (%)		85.0		85.0
Expected terms of the option (years)		6.11		6.25
Risk-free interest rate (%)		1.17		0.37-0.52

Schedule of options granted to purchase common stock

	For the Nine Months Ended September 30, 2021
	Number of Options			Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding at the beginning of period		3,569,766			3.12		12,338
Granted		985,530			7.02
Forfeited		(116,235	)		4.72
Exercised		(79,545	)		1.52
Outstanding at the end of period		4,359,516			3.99		9,380
Exercisable at the end of period		2,354,505
Weighted average remaining contractual life of outstanding options – years as of September 30, 2021		7.43

Schedule of share-based payment expenses

	Nine Months Ended September  30,
	2021		2020
Research and development expenses, net		1,539		1,345
General and administrative		1,113		783
		2,652		2,128

	Three Months Ended September  30,
	2021		2020
Research and development expenses, net		581		843
General and administrative		446		271
		1,027		1,114

Warrant [Member]

Stockholders Equity (Tables) [Line Items]

Schedule of outstanding warrants

Warrant	Issuance Date	Expiration Date	Exercise Price Per Share			Number of Shares of Common Stock Underlying Warrants
Private Warrants issued to Yeda (see 1 below)	May 11, 2017	May 11, 2025		(*	)		-
Private Warrants issued to scientific founders (see 2 below)	November 27, 2017			-			2,974
							2,974