Stockholders Equity (Tables)

12 Months Ended

Dec. 31, 2021

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 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

	2021		2020
Underlying value of Common Stock ($)		7.02		5.59-6.44
Exercise price ($)		7.02		5.59-6.44
Expected volatility (%)		85.0		85.0
Expected terms of the option (years)		6.11		6.11
Risk-free interest rate (%)		1.17		0.39-0.68

Schedule of options granted to purchase common stock

	For year ended December 31, 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		(386,508	)		4.60
Exercised		(84,239	)	$	1.55
Outstanding at the end of period		4,084,549			3.95	$	671
Vested at end of period		2,486,381
Weighted average remaining contractual life – years as of December 31, 2021		6.82

	For year ended December 31, 2020
	Number of Options			Weighted average exercise price		Aggregate intrinsic value
Outstanding at the beginning of period		3,143,802		$	1.61	$	25,733
Granted		925,700			6.17
Forfeited		(108,110	)		4.66
Exercised		(391,626	)	$	0.79
Outstanding at the end of period		3,569,766		$	3.12	$	12,338
Vested at end of period		2,334,037
Weighted average remaining contractual life – years as of December 31, 2020		7.62

Schedule of share-based payment expenses

	Year ended December 31,
	2021		2020
Research and development expenses, net		1,770		1,815
General and administrative		1,467		1,075
		3,237		2,890

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