CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Series A convertible preferred stock	Series B convertible preferred stock	Series C convertible preferred stock	Series D convertible preferred stock
Balance at Dec. 31, 2019	$ (121,796)		$ 1,546	$ 10	$ (123,352)
Balance, Shares at Dec. 31, 2019						57,758,734	12,500,000	27,528,581
Balance at Dec. 31, 2019						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Dec. 31, 2019		434,942
Vesting of restricted common stock	11		11
Vesting of restricted common stock, Shares		21,872
Stock-based compensation expense	225		225
Unrealized gain (loss) on available-for-sale securities	(9)			(9)
Net loss	(11,535)				(11,535)
Balance at Mar. 31, 2020	(133,104)		1,782	1	(134,887)
Balance, Shares at Mar. 31, 2020						57,758,734	12,500,000	27,528,581
Balance at Mar. 31, 2020						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Mar. 31, 2020		456,814
Balance at Dec. 31, 2019	(121,796)		1,546	10	(123,352)
Balance, Shares at Dec. 31, 2019						57,758,734	12,500,000	27,528,581
Balance at Dec. 31, 2019						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Dec. 31, 2019		434,942
Unrealized gain (loss) on available-for-sale securities	(10)
Net loss	(19,342)
Balance at Jun. 30, 2020	(140,717)		1,977		(142,694)
Balance, Shares at Jun. 30, 2020						57,758,734	12,500,000	27,528,581
Balance at Jun. 30, 2020						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Jun. 30, 2020		477,138
Balance at Mar. 31, 2020	(133,104)		1,782	1	(134,887)
Balance, Shares at Mar. 31, 2020						57,758,734	12,500,000	27,528,581
Balance at Mar. 31, 2020						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Mar. 31, 2020		456,814
Vesting of restricted common stock	16		16
Vesting of restricted common stock, Shares		20,324
Stock-based compensation expense	179		179
Unrealized gain (loss) on available-for-sale securities	(1)			(1)
Net loss	(7,807)				(7,807)
Balance at Jun. 30, 2020	(140,717)		1,977		(142,694)
Balance, Shares at Jun. 30, 2020						57,758,734	12,500,000	27,528,581
Balance at Jun. 30, 2020						$ 57,682	$ 24,957	$ 55,005
Balance, Shares at Jun. 30, 2020		477,138
Balance at Dec. 31, 2020	$ (54,781)	$ 1	107,908	(1)	(162,689)
Balance, Shares at Dec. 31, 2020	139,527,869					57,758,734	12,500,000	37,528,581	31,740,554
Balance at Dec. 31, 2020	$ 93,091					$ 16,176	$ 5,700	$ 16,759	$ 54,456
Balance, Shares at Dec. 31, 2020		521,052
Issuance of common stock upon exercise of stock options	17		17
Issuance of common stock upon exercise of stock options, Shares		3,773
Vesting of restricted common stock	4		4
Vesting of restricted common stock, Shares		10,202
Stock-based compensation expense	646		646
Issuance of Series D convertible preferred stock									$ 27,400
Issuance of Series D convertible preferred stock, Shares									15,870,209
Conversion of convertible preferred stock into common stock upon completion of initial public offering	120,491	$ 17	120,474
Conversion of convertible preferred stock into common stock upon completion of initial public offering, Shares						(57,758,734)	(12,500,000)	(37,528,581)	(47,610,763)
Conversion of convertible preferred stock into common stock upon completion of initial public offering						$ (16,176)	$ (5,700)	$ (16,759)	$ (81,856)
Conversion of convertible preferred stock into common stock upon completion of initial public offering, Shares		16,662,011
Issuance of common stock upon completion of initial public offering, net of commissions, underwriting discounts and offering costs	124,779	$ 7	124,772
Issuance of common stock upon completion of initial public offering, net of commissions, underwriting discounts and offering costs, Shares		7,662,000
Unrealized gain (loss) on available-for-sale securities	(20)			(20)
Net loss	(10,870)				(10,870)
Balance at Mar. 31, 2021	180,266	$ 25	353,821	(21)	(173,559)
Balance, Shares at Mar. 31, 2021		24,859,038
Balance at Dec. 31, 2020	$ (54,781)	$ 1	107,908	(1)	(162,689)
Balance, Shares at Dec. 31, 2020	139,527,869					57,758,734	12,500,000	37,528,581	31,740,554
Balance at Dec. 31, 2020	$ 93,091					$ 16,176	$ 5,700	$ 16,759	$ 54,456
Balance, Shares at Dec. 31, 2020		521,052
Conversion of convertible preferred stock into common stock upon completion of initial public offering, Shares	16,662,011
Unrealized gain (loss) on available-for-sale securities	$ 6
Net loss	(22,521)
Balance at Jun. 30, 2021	169,411	$ 25	354,591	5	(185,210)
Balance, Shares at Jun. 30, 2021						0	0	0	0
Balance, Shares at Jun. 30, 2021		24,868,817
Balance at Mar. 31, 2021	180,266	$ 25	353,821	(21)	(173,559)
Balance, Shares at Mar. 31, 2021		24,859,038
Issuance of common stock upon exercise of stock options	1		1
Issuance of common stock upon exercise of stock options, Shares		354
Vesting of restricted common stock	5		5
Vesting of restricted common stock, Shares		9,425
Stock-based compensation expense	764		764
Unrealized gain (loss) on available-for-sale securities	26			26
Net loss	(11,651)				(11,651)
Balance at Jun. 30, 2021	$ 169,411	$ 25	$ 354,591	$ 5	$ (185,210)
Balance, Shares at Jun. 30, 2021						0	0	0	0
Balance, Shares at Jun. 30, 2021		24,868,817