Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity Deficit - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock	Common Stock	Additional paid-in capital	Accumulated deficit
Beginning balance at Dec. 31, 2019		$ 21,942
Beginning Balance, Shares at Dec. 31, 2019		22,724,925
Beginning balance at Dec. 31, 2019	$ (2,874)			$ 1	$ 40	$ (2,915)
Beginning Balance, Shares at Dec. 31, 2019				828,356
Vesting of restricted common stock	1				1
Vesting of restricted common stock ( Shares)				76,933
Stock-based compensation	9				9
Net loss	(1,958)					(1,958)
Ending balance at Mar. 31, 2020		$ 21,942
Ending balance (in shares) at Mar. 31, 2020		22,724,925
Ending balance at Mar. 31, 2020	(4,822)			$ 1	50	(4,873)
Ending balance (in shares) at Mar. 31, 2020				905,289
Beginning balance at Dec. 31, 2019		$ 21,942
Beginning Balance, Shares at Dec. 31, 2019		22,724,925
Beginning balance at Dec. 31, 2019	(2,874)			$ 1	40	(2,915)
Beginning Balance, Shares at Dec. 31, 2019				828,356
Net loss	(8,249)
Ending balance at Sep. 30, 2020		$ 21,942
Ending balance (in shares) at Sep. 30, 2020		22,724,925
Ending balance at Sep. 30, 2020	(11,087)			$ 1	76	(11,164)
Ending balance (in shares) at Sep. 30, 2020				1,133,301
Beginning balance at Dec. 31, 2019		$ 21,942
Beginning Balance, Shares at Dec. 31, 2019		22,724,925
Beginning balance at Dec. 31, 2019	(2,874)			$ 1	40	(2,915)
Beginning Balance, Shares at Dec. 31, 2019				828,356
Ending balance at Dec. 31, 2020		$ 21,942
Ending balance (in shares) at Dec. 31, 2020		22,724,925
Ending balance at Dec. 31, 2020	(15,645)			$ 1	97	(15,743)
Ending balance (in shares) at Dec. 31, 2020				1,289,342
Beginning balance at Mar. 31, 2020		$ 21,942
Beginning Balance, Shares at Mar. 31, 2020		22,724,925
Beginning balance at Mar. 31, 2020	(4,822)			$ 1	50	(4,873)
Beginning Balance, Shares at Mar. 31, 2020				905,289
Vesting of restricted common stock	1				1
Vesting of restricted common stock ( Shares)				76,933
Stock-based compensation	9				9
Issuance of common stock	2				2
Issuance of common stock (Shares)				48,919
Net loss	(3,100)					(3,100)
Ending balance at Jun. 30, 2020		$ 21,942
Ending balance (in shares) at Jun. 30, 2020		22,724,925
Ending balance at Jun. 30, 2020	(7,910)			$ 1	62	(7,973)
Ending balance (in shares) at Jun. 30, 2020				1,031,141
Vesting of restricted common stock	3				3
Vesting of restricted common stock ( Shares)				102,160
Stock-based compensation	11				11
Net loss	(3,191)					(3,191)
Ending balance at Sep. 30, 2020		$ 21,942
Ending balance (in shares) at Sep. 30, 2020		22,724,925
Ending balance at Sep. 30, 2020	(11,087)			$ 1	76	(11,164)
Ending balance (in shares) at Sep. 30, 2020				1,133,301
Beginning balance at Dec. 31, 2020		$ 21,942
Beginning Balance, Shares at Dec. 31, 2020		22,724,925
Beginning balance at Dec. 31, 2020	(15,645)			$ 1	97	(15,743)
Beginning Balance, Shares at Dec. 31, 2020				1,289,342
Issuance of Series B convertible preferred stock, net of issuance costs of $419			$ 172,081
Issuance of Series B convertible preferred stock, net of issuance costs of $419, Shares			104,812,248
Vesting of restricted common stock	3				3
Vesting of restricted common stock ( Shares)				123,085
Stock-based compensation	2,450				2,450
Net loss	(36,968)					(36,968)
Ending balance at Mar. 31, 2021		$ 21,942	$ 172,081
Ending balance (in shares) at Mar. 31, 2021		22,724,925	104,812,248
Ending balance at Mar. 31, 2021	(50,160)			$ 1	2,550	(52,711)
Ending balance (in shares) at Mar. 31, 2021				1,412,427
Beginning balance at Dec. 31, 2020		$ 21,942
Beginning Balance, Shares at Dec. 31, 2020		22,724,925
Beginning balance at Dec. 31, 2020	$ (15,645)			$ 1	97	(15,743)
Beginning Balance, Shares at Dec. 31, 2020				1,289,342
Stock options exercised (Shares)	16,370
Net loss	$ (59,146)
Ending balance at Sep. 30, 2021		$ 21,942	$ 172,081
Ending balance (in shares) at Sep. 30, 2021		22,724,925	104,812,248
Ending balance at Sep. 30, 2021	(71,439)			$ 2	3,448	(74,889)
Ending balance (in shares) at Sep. 30, 2021				1,639,600
Beginning balance at Mar. 31, 2021		$ 21,942	$ 172,081
Beginning Balance, Shares at Mar. 31, 2021		22,724,925	104,812,248
Beginning balance at Mar. 31, 2021	(50,160)			$ 1	2,550	(52,711)
Beginning Balance, Shares at Mar. 31, 2021				1,412,427
Vesting of restricted common stock	3			$ 1	2
Vesting of restricted common stock ( Shares)				106,580
Stock-based compensation	572				572
Net loss	(8,003)					(8,003)
Ending balance at Jun. 30, 2021		$ 21,942	$ 172,081
Ending balance (in shares) at Jun. 30, 2021		22,724,925	104,812,248
Ending balance at Jun. 30, 2021	(57,588)			$ 2	3,124	(60,714)
Ending balance (in shares) at Jun. 30, 2021				1,519,007
Vesting of restricted common stock	3				3
Vesting of restricted common stock ( Shares)				104,223
Stock options exercised	14				14
Stock options exercised (Shares)				16,370
Stock-based compensation	307				307
Net loss	(14,175)					(14,175)
Ending balance at Sep. 30, 2021		$ 21,942	$ 172,081
Ending balance (in shares) at Sep. 30, 2021		22,724,925	104,812,248
Ending balance at Sep. 30, 2021	$ (71,439)			$ 2	$ 3,448	$ (74,889)
Ending balance (in shares) at Sep. 30, 2021				1,639,600