CONDENSED CONSOLIDATED STATEMENTS OF CHANGE IN CONVERTIBLE AND REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Convertible preferred stock	Redeemable Preferred Stock	Common stock		Treasury stock	Receivables on account of stock	Additional paid-in capital	Accumulated deficit	Total
Balance at Dec. 31, 2019			$ 2		$ (4,881)	$ (882)	$ 0	$ (204,520)	$ (210,281)
Balance (in shares) at Dec. 31, 2019			22,959,969
Balance at Dec. 31, 2019	$ 1,921	$ 155,550
Balance (in Shares) at Dec. 31, 2019	1,043,778	15,779,322
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019					7,685,190
Accretion of redeemable convertible preferred stock	$ 0	$ 2,641
Accretion of redeemable convertible preferred stock			$ 0		$ 0	0	(2,641)	0	(2,641)
Accretion of redeemable convertible preferred stock (in Shares)	0	0	0		0
Conversion of convertible and redeemable convertible preferred stock to common stock upon initial public offering									0
Stock-based compensation expenses	$ 0	$ 0	$ 0		$ 0	0	2,829	0	2,829
Issuance of common shares upon exercise of stock options	$ 0	$ 0		[1]	$ 0	0	63	0	63
Issuance of common shares upon exercise of stock options (in Shares)	0	0	1,049,812		0
Issuance of common shares upon business combination	$ 0	$ 0		[1]	$ 0		2,578	0	2,578
Issuance of common shares upon business combination (in Shares)			1,226,515		0
Net loss	0	0	$ 0		$ 0	0	0	(22,424)	(22,424)
Treasury Stock, Shares, Ending Balance at Sep. 30, 2020					7,685,190
Balance at Sep. 30, 2020			$ 2		$ (4,881)	(882)	2,829	(226,944)	(229,876)
Balance (in shares) at Sep. 30, 2020			25,236,296
Balance at Sep. 30, 2020	$ 1,921	$ 158,191
Balance (in Shares) at Sep. 30, 2020	1,043,778	15,779,322
Balance at Dec. 31, 2019			$ 2		$ (4,881)	(882)	0	(204,520)	(210,281)
Balance (in shares) at Dec. 31, 2019			22,959,969
Balance at Dec. 31, 2019	$ 1,921	$ 155,550
Balance (in Shares) at Dec. 31, 2019	1,043,778	15,779,322
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019					7,685,190
Issuance of preferred stock upon exercise of warrants									$ 0
Treasury Stock, Shares, Ending Balance at Dec. 31, 2020					7,685,190				7,685,190
Balance at Dec. 31, 2020			$ 2		$ (4,881)	(882)	8,388	(263,283)	$ (260,656)
Balance (in shares) at Dec. 31, 2020			25,467,922						25,467,922
Balance at Dec. 31, 2020	$ 1,921	$ 158,191							$ 160,112
Balance (in Shares) at Dec. 31, 2020	1,043,778	15,779,322
Balance at Jun. 30, 2020			$ 2		$ (4,881)	(882)	1,759	(220,510)	(224,512)
Balance (in shares) at Jun. 30, 2020			25,194,253
Balance at Jun. 30, 2020	$ 1,921	$ 158,191
Balance (in Shares) at Jun. 30, 2020	1,043,778	15,779,322
Treasury Stock, Shares, Beginning Balance at Jun. 30, 2020					7,685,190
Stock-based compensation expenses	$ 0	$ 0	$ 0		$ 0	0	1,033	0	1,033
Issuance of common shares upon exercise of stock options	$ 0	$ 0		[1]	0	0	37	0	37
Issuance of common shares upon exercise of stock options (in Shares)	0	0	42,043
Net loss	$ 0	$ 0	$ 0		$ 0	0	0	(6,434)	(6,434)
Treasury Stock, Shares, Ending Balance at Sep. 30, 2020					7,685,190
Balance at Sep. 30, 2020			$ 2		$ (4,881)	(882)	2,829	(226,944)	(229,876)
Balance (in shares) at Sep. 30, 2020			25,236,296
Balance at Sep. 30, 2020	$ 1,921	$ 158,191
Balance (in Shares) at Sep. 30, 2020	1,043,778	15,779,322
Balance at Dec. 31, 2020			$ 2		$ (4,881)	(882)	8,388	(263,283)	$ (260,656)
Balance (in shares) at Dec. 31, 2020			25,467,922						25,467,922
Balance at Dec. 31, 2020	$ 1,921	$ 158,191							$ 160,112
Balance (in Shares) at Dec. 31, 2020	1,043,778	15,779,322
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2020					7,685,190				7,685,190
Accretion of redeemable convertible preferred stock	$ 0	$ 1,569
Accretion of redeemable convertible preferred stock			$ 0		$ 0	0	(1,569)	0	$ (1,569)
Accretion of redeemable convertible preferred stock (in Shares)	0	0
Redemption of redeemable convertible preferred stock upon initial public offering (in Shares)	0	0	0		0
Redemption of redeemable convertible preferred stock upon initial public offering	$ 0	$ (1,569)	$ 0		$ 0	0	0	0	0
Conversion of convertible and redeemable convertible preferred stock to common stock upon initial public offering (in Shares)	(1,043,778)	(15,806,333)	76,262,942		0
Conversion of convertible and redeemable convertible preferred stock to common stock upon initial public offering	$ (1,921)	$ (159,340)	$ 8		$ 0	0	161,253	0	161,261
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other issuance costs	0	$ 0	$ 2		$ 0	0	155,596	0	$ 155,598
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other issuance costs (in Shares)		0	17,250,000		0				0
Conversion of warrants to common stock upon initial public offering	$ 0	$ 0	$ 1		$ 0		70,676	0	$ 70,677
Stock Issued During Period, Shares, Conversion Of Warrants To Common Stock (in Shares)	0	0	7,067,699		0
Stock-based compensation expenses	$ 0	$ 0	$ 0		$ 0		12,910	0	12,910
Loan forgiveness	0	0	0		0	882	0	0	882
Issuance of common shares upon exercise of stock options	$ 0	$ 0		[1]	0	0	661	0	661
Issuance of common shares upon exercise of stock options (in Shares)	0	0	527,437
Issuance of preferred stock upon exercise of warrants	$ 0		$ 0		$ 0	0	0	0	0
Issuance of preferred stock upon exercise of warrants		$ 1,149							1,149
Issuance of preferred stock upon exercise of warrants (in Shares)	0	27,011	0		0
Net loss		$ 0	$ 0		$ 0	0	0	(43,425)	$ (43,425)
Treasury Stock, Shares, Ending Balance at Sep. 30, 2021					7,685,190				7,685,190
Balance at Sep. 30, 2021			$ 13		$ (4,881)	0	407,915	(306,708)	$ 96,339
Balance (in shares) at Sep. 30, 2021			126,576,000						126,576,000
Balance at Sep. 30, 2021	$ 0	$ 0							$ 0
Balance (in Shares) at Sep. 30, 2021	0	0
Balance at Jun. 30, 2021			$ 2		$ (4,881)		17,838	(281,558)	(268,599)
Balance (in shares) at Jun. 30, 2021			25,794,262
Balance at Jun. 30, 2021	$ 1,921	$ 159,340
Balance (in Shares) at Jun. 30, 2021	1,043,778	15,806,333
Treasury Stock, Shares, Beginning Balance at Jun. 30, 2021					7,685,190
Accretion of redeemable convertible preferred stock	$ 0	$ 1,569
Accretion of redeemable convertible preferred stock			$ 0		$ 0		(1,569)	0	(1,569)
Redemption of redeemable convertible preferred stock upon initial public offering	$ 0	$ (1,569)	$ 0		$ 0		0	0	0
Conversion of convertible and redeemable convertible preferred stock to common stock upon initial public offering (in Shares)	(1,043,778)	(15,806,333)	76,262,942		0
Conversion of convertible and redeemable convertible preferred stock to common stock upon initial public offering	$ (1,921)	$ (159,340)	$ 8		$ 0		161,253	0	161,261
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other issuance costs	$ 0	$ 0	$ 2		$ 0		155,596	0	155,598
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other issuance costs (in Shares)	0	0	17,250,000		0
Conversion of warrants to common stock upon initial public offering	$ 0	$ 0	$ 1		$ 0		70,676	0	70,677
Stock Issued During Period, Shares, Conversion Of Warrants To Common Stock (in Shares)	0	0	7,067,699		0
Stock-based compensation expenses	$ 0	$ 0	$ 0		$ 0		3,736	0	3,736
Issuance of common shares upon exercise of stock options	$ 0	$ 0		[1]	$ 0		385	0	385
Issuance of common shares upon exercise of stock options (in Shares)	0	0	201,097		0
Net loss		$ 0			$ 0		0	(25,150)	$ (25,150)
Treasury Stock, Shares, Ending Balance at Sep. 30, 2021					7,685,190				7,685,190
Balance at Sep. 30, 2021			$ 13		$ (4,881)	$ 0	$ 407,915	$ (306,708)	$ 96,339
Balance (in shares) at Sep. 30, 2021			126,576,000						126,576,000
Balance at Sep. 30, 2021	$ 0	$ 0							$ 0
Balance (in Shares) at Sep. 30, 2021	0	0

[1] Represents an amount lower than $ 1