FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Summary of assumptions in the Black-Scholes model in calculating fair value of warrants

	December 31,
	2019		2020		2021
Expected term	3		2.25		1.25
Expected dividend yield	0	%	0	%	0	%
Expected volatility	78.11	%	96.83	%	83.00	%
Risk-free interest rate	1.91	%	0.42	%	0.75	%

Summary of change in the fair value of the preferred share warrants liability

	2020		2021
Beginning of year	$	5,163	$	5,366
Change in fair value		203		13,257
End of year	$	5,366	$	18,623