Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (unaudited) - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2019	$ (123,338)	$ 130,666		$ 4,419	$ (127,757)
Balance, Shares at Dec. 31, 2019		209,119,674	230,860
Issuance of Series C redeemable convertible preferred stock, net of issuance costs		$ 29,446
Issuance of Series C redeemable convertible preferred stock, net of issuance costs, Shares		78,306,611
Accretion of convertible preferred stock to redemption value	(115)			(115)
Temporary equity, Accretion of convertible preferred stock to redemption value		$ 115
Issuance of common stock warrants in conjunction with sale of Series C redeemable convertible preferred stock	740			740
Conversion of redeemable convertible preferred stock to common stock upon closing of initial public offering	160,227	$ (160,227)	$ 8	160,219
Conversion of redeemable convertible preferred stock to common stock upon closing of initial public offering, Shares		(287,426,285)	8,335,248
Issuance of common stock from initial public offering, net of issuance costs	57,328		$ 4	57,324
Issuance of common stock from initial public offering, net of issuance costs, Shares			4,025,000
Vesting of restricted common stock			19,661
Issuance of common stock upon exercise of warrants			$ 1	(1)
Issuance of common stock upon exercise of warrants, Shares			313,794
Stock-based compensation	753			753
Net loss	(8,772)				(8,772)
Balance at Jun. 30, 2020	86,823		$ 13	223,339	(136,529)
Balance, Shares at Jun. 30, 2020			12,924,563
Balance at Mar. 31, 2020	(126,781)	$ 160,197		5,208	(131,989)
Balance, Shares at Mar. 31, 2020		287,426,285	230,860
Accretion of convertible preferred stock to redemption value	(30)			(30)
Temporary equity, Accretion of convertible preferred stock to redemption value		$ 30
Conversion of redeemable convertible preferred stock to common stock upon closing of initial public offering	160,227	$ (160,227)	$ 8	160,219
Conversion of redeemable convertible preferred stock to common stock upon closing of initial public offering, Shares		(287,426,285)	8,335,248
Issuance of common stock from initial public offering, net of issuance costs	57,328		$ 4	57,324
Issuance of common stock from initial public offering, net of issuance costs, Shares			4,025,000
Vesting of restricted common stock			19,661
Issuance of common stock upon exercise of warrants			$ 1	(1)
Issuance of common stock upon exercise of warrants, Shares			313,794
Stock-based compensation	619			619
Net loss	(4,540)				(4,540)
Balance at Jun. 30, 2020	86,823		$ 13	223,339	(136,529)
Balance, Shares at Jun. 30, 2020			12,924,563
Balance at Dec. 31, 2020	74,492		$ 13	224,363	(149,884)
Balance, Shares at Dec. 31, 2020			12,932,377
Exercise of common stock options	$ 593			593
Exercise of common stock options, Shares	68,728		68,728
Stock-based compensation	$ 1,255			1,255
Net loss	(18,841)				(18,841)
Balance at Jun. 30, 2021	57,499		$ 13	226,211	(168,725)
Balance, Shares at Jun. 30, 2021			13,001,105
Balance at Mar. 31, 2021	67,551		$ 13	225,224	(157,686)
Balance, Shares at Mar. 31, 2021			12,962,768
Exercise of common stock options	331			331
Exercise of common stock options, Shares			38,337
Stock-based compensation	656			656
Net loss	(11,039)				(11,039)
Balance at Jun. 30, 2021	$ 57,499		$ 13	$ 226,211	$ (168,725)
Balance, Shares at Jun. 30, 2021			13,001,105