Shareholders’ Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 05, 2021	Oct. 20, 2020	Jul. 31, 2017	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	May 01, 2020
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized				2,000,000		2,000,000	2,000,000
Common stock, shares authorized				250,000,000		250,000,000	250,000,000
Common sock, shares issued				167,036,511		167,036,511	153,095,883
Common stock, outstanding				167,036,511		167,036,511	153,095,883
Stock Issued During Period, Value, New Issues				$ 7,874	$ 19,008
Number of warrants exercised		11,738
Hadasit Bio-Holdings Ltd. [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants issued to purchase ordinary shares			24,566
Warrants exercise price per share			$ 40.5359
Warrant expiration date			July 2022
Asterias Biotherapeutics, Inc [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants issued to purchase ordinary shares				1,089,900		1,089,900
Warrants exercisable term						30 days
Warrants exercise price per share				$ 6.15		$ 6.15
Warrant expiration date				May 13, 2021		May 13, 2021
Consultants [Member] | Cell Cure Warrants [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants issued to purchase ordinary shares				13,738		13,738
Common Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Stock Issued During Period, Value, New Issues				$ 7,874	19,008
Remaining Warrants [Member] | Hadasit Bio-Holdings Ltd. [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants exercise price per share				$ 40.00		$ 40.00
Warrant expiration date						January 2024
Remaining Warrants [Member] | Consultants [Member] | Cell Cure Warrants [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants issued to purchase ordinary shares				2,000		2,000
Maximum [Member] | Consultants [Member] | Cell Cure Warrants [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants exercise price per share				$ 40.00		$ 40.00
Minimum [Member] | Consultants [Member] | Cell Cure Warrants [Member]
Subsidiary or Equity Method Investee [Line Items]
Warrants exercise price per share				$ 32.02		$ 32.02
Sales Agreement [Member] | Parent Company [Member]
Subsidiary or Equity Method Investee [Line Items]
Common sock, shares issued				13,859,776		13,859,776
Stock Issued During Period, Value, New Issues	$ 50,000					$ 50,000
Sale of stock price per share				$ 2.39		$ 2.39
Proceeds from Issuance of Common Stock				$ 8,100	$ 25,000	$ 33,100
Sales Agreement [Member] | Parent Company [Member] | Common Stock [Member]
Subsidiary or Equity Method Investee [Line Items]
Sale of stock value	$ 25,000
Cantor Fitzgerald and Co Member [Member] | 2017 Sales Agreement [Member]
Subsidiary or Equity Method Investee [Line Items]
Percentage of commission payable						3.00%
Cantor Fitzgerald and Co Member [Member] | 2017 Sales Agreement [Member] | Maximum [Member]
Subsidiary or Equity Method Investee [Line Items]
Aggregate offering price								$ 25,000
Cantor Fitzgerald and Co Member [Member] | Sales Agreement [Member] | Parent Company [Member] | Controlled Equity Offering [Member]
Subsidiary or Equity Method Investee [Line Items]
Common sock, shares issued				2,824,332	11,035,444	2,824,332
Sale of stock price per share				$ 2.87	$ 2.27	$ 2.87