Liabilities Presented At Fair Value (Tables)

12 Months Ended

Dec. 31, 2019

Liabilities Presented At Fair Value [Abstract]

Warrants to Purchase Preferred Shares

	Year ended December 31,
	2019			2018			2017
	Ordinary shares			Ordinary shares			Preferred F-2 shares
Risk-free interest rate		1.7	%		2.5	%		1.5	%
Expected volatility		80	%		80	%		90	%
Expected life (in years)		2.5			3.5			4.5
Expected dividend yield		0			0			0

Changes in the Fair Value of Warrants

	Fair value of warrants to purchase Ordinary shares
Balance at December 31, 2017		10,300
Exercise of warrants		(3,851	)
Revaluation of financial derivatives		17,600
Balance at December 31, 2018		24,049
Exercise of warrants		(2,924	)
Revaluation of financial derivatives		(15,904	)
Balance at December 31, 2019	$	5,221