UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Redeemable Series A-1 Preferred Stock	Convertible And Redeemable Series A-2 Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2019	$ (26,291)				$ 38,153	$ (64,404)	$ (40)
Beginning balance, shares at Dec. 31, 2019				8,370,107
Beginning balance at Dec. 31, 2019		$ 128,822
Beginning balance, shares at Dec. 31, 2019		12,000
Net income (loss)	(41,248)					(41,248)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(5,415)				(5,415)
Accretion of the redeemable series A-1 preferred stock to redeemable value		$ 5,415
Stock-based compensation	1,150				1,150
Accumulated other comprehensive income (loss)	37						37
Ending balance at Mar. 31, 2020	(71,767)				33,888	(105,652)	(3)
Ending balance, shares at Mar. 31, 2020		12,000
Ending balance at Mar. 31, 2020		$ 134,237
Ending balance, shares at Mar. 31, 2020				8,370,107
Beginning balance at Dec. 31, 2019	(26,291)				38,153	(64,404)	(40)
Beginning balance, shares at Dec. 31, 2019				8,370,107
Beginning balance at Dec. 31, 2019		$ 128,822
Beginning balance, shares at Dec. 31, 2019		12,000
Net income (loss)	(58,761)
Redemption of the series A-1	$ 26,801
Redemption of the series A-1, shares	1,786,739
Common stock issued	$ 224,515
Common stock issued, shares	16,523,015
Dividend payment to the Series A-2 preferred shareholders			$ (2,900)
Issuance of common stock in connection with the initial public offering, net of issuance costs of $15.6 million, shares	11,500,000
Cancellation of shares	(117,785)
Ending balance at Sep. 30, 2020	$ 138,767				261,945	(123,165)	(13)
Ending balance, shares at Sep. 30, 2020			17,500
Ending balance at Sep. 30, 2020			$ 152,928
Ending balance, shares at Sep. 30, 2020				24,893,122
Beginning balance at Mar. 31, 2020	(71,767)				33,888	(105,652)	(3)
Beginning balance, shares at Mar. 31, 2020				8,370,107
Beginning balance at Mar. 31, 2020		$ 134,237
Beginning balance, shares at Mar. 31, 2020		12,000
Net income (loss)	13,224					13,224
Accretion of the redeemable series A-1 preferred stock to redeemable value	(5,644)				(5,644)
Accretion of the redeemable series A-1 preferred stock to redeemable value		$ 5,644
Issuance of the convertible and redeemable series A-2 preferred stock			$ 152,928
Issuance of the convertible and redeemable series A-2 preferred stock, shares			17,500
Stock-based compensation	1,140				1,140
Common stock issued	25,021				25,021
Common stock issued, shares				794,639
Accumulated other comprehensive income (loss)	(90)						(90)
Ending balance at Jun. 30, 2020	(38,116)				54,405	(92,428)	(93)
Ending balance, shares at Jun. 30, 2020		12,000	17,500
Ending balance at Jun. 30, 2020		$ 139,881	$ 152,928
Ending balance, shares at Jun. 30, 2020				9,164,746
Net income (loss)	(30,737)					(30,737)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(6,542)				(6,542)
Accretion of the redeemable series A-1 preferred stock to redeemable value		6,542
Series A-1 preferred stock deemed dividend	(24,341)				(24,341)
Series A-1 preferred stock deemed dividend		$ 24,341
Redemption of the series A-1	$ 26,801				26,801
Temporary equity redemption of the series A-1, shares		(12,000)
Temporary equity redemption of the series A-1, value		$ (170,764)
Redemption of the series A-1, shares	1,786,739			1,786,739
Stock-based compensation	$ 1,149				1,149
Common stock issued	$ 150				150
Common stock issued, shares	15,728,376			26,850
Dividend payment to the Series A-2 preferred shareholders	$ (2,870)		$ (2,900)		(2,870)
Exercise of the series A-1 preferred stock warrant	11,871				11,871
Exercise of the series A-1 preferred stock warrant, shares				534,240
Exercise of the series A-2 preferred stock warrant	44,441				44,441
Exercise of the series A-2 preferred stock warrant, shares				1,999,999
Issuance of common stock in connection with the initial public offering, net of issuance costs of $15.6 million	$ 156,881				156,881
Issuance of common stock in connection with the initial public offering, net of issuance costs of $15.6 million, shares	11,500,000			11,500,000
Cancellation of shares	(117,785)			(119,452)
Accumulated other comprehensive income (loss)	$ 80						80
Ending balance at Sep. 30, 2020	138,767				261,945	(123,165)	(13)
Ending balance, shares at Sep. 30, 2020			17,500
Ending balance at Sep. 30, 2020			$ 152,928
Ending balance, shares at Sep. 30, 2020				24,893,122
Beginning balance at Dec. 31, 2020	137,145				259,427	(122,353)	71
Beginning balance, shares at Dec. 31, 2020				24,932,527
Beginning balance at Dec. 31, 2020			$ 152,928
Beginning balance, shares at Dec. 31, 2020			17,500
Net income (loss)	(11,596)					(11,596)
Stock-based compensation	1,805				1,805
Common stock issued	4,456				4,456
Common stock issued, shares				506,330
Dividend payment to the Series A-2 preferred shareholders	(4,100)				(4,100)
Accumulated other comprehensive income (loss)	29						29
Ending balance at Mar. 31, 2021	127,739				261,588	(133,949)	100
Ending balance, shares at Mar. 31, 2021			17,500
Ending balance at Mar. 31, 2021			$ 152,928
Ending balance, shares at Mar. 31, 2021				25,438,857
Beginning balance at Dec. 31, 2020	137,145				259,427	(122,353)	71
Beginning balance, shares at Dec. 31, 2020				24,932,527
Beginning balance at Dec. 31, 2020			$ 152,928
Beginning balance, shares at Dec. 31, 2020			17,500
Net income (loss)	(23,853)
Common stock issued	$ 38,136
Common stock issued, shares	1,593,317
Dividend payment to the Series A-2 preferred shareholders			$ (12,300)
Ending balance at Sep. 30, 2021	$ 145,698				291,850	(146,206)	54
Ending balance, shares at Sep. 30, 2021			17,500
Ending balance at Sep. 30, 2021			$ 152,928
Ending balance, shares at Sep. 30, 2021				26,525,844
Beginning balance at Mar. 31, 2021	127,739				261,588	(133,949)	100
Beginning balance, shares at Mar. 31, 2021				25,438,857
Beginning balance at Mar. 31, 2021			$ 152,928
Beginning balance, shares at Mar. 31, 2021			17,500
Net income (loss)	(14,483)					(14,483)
Stock-based compensation	2,417				2,417
Common stock issued	27,460				27,460
Common stock issued, shares				669,331
Dividend payment to the Series A-2 preferred shareholders	(4,100)				(4,100)
Accumulated other comprehensive income (loss)	28						28
Ending balance at Jun. 30, 2021	139,061				287,365	(148,432)	128
Ending balance, shares at Jun. 30, 2021			17,500
Ending balance at Jun. 30, 2021			$ 152,928
Ending balance, shares at Jun. 30, 2021				26,108,188
Net income (loss)	2,226					2,226
Stock-based compensation	2,365				2,365
Common stock issued	$ 6,220				6,220
Common stock issued, shares	417,656			417,656
Dividend payment to the Series A-2 preferred shareholders	$ (4,100)		$ (4,100)		(4,100)
Accumulated other comprehensive income (loss)	(74)						(74)
Ending balance at Sep. 30, 2021	$ 145,698				$ 291,850	$ (146,206)	$ 54
Ending balance, shares at Sep. 30, 2021			17,500
Ending balance at Sep. 30, 2021			$ 152,928
Ending balance, shares at Sep. 30, 2021				26,525,844