Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement [Line Items]
Beginning balance	$ 87,153	$ (63,670)
Conversion of convertible preferred stock into common stock		165,136
Initial public offering, net of underwriting discounts, commissions and offering costs		63,872
Issuance of common stock under employee benefit plans	1,430	253
Vesting of restricted stock awards	15	15
Stock-based compensation expense	7,350	4,224
Unrealized loss on marketable securities	(2)
Net loss	(70,819)	(82,677)
Ending balance	95,181	$ 87,153
Private Placement
Statement [Line Items]
Issuance of common stock, net of issuance costs	64,318
At-The-Market Offering
Statement [Line Items]
Issuance of common stock, net of issuance costs	5,736
Series A Convertible Preferred Stock
Statement [Line Items]
Convertible preferred stock, Beginning balance, Shares		60,000,000
Convertible preferred stock, Beginning balance		$ 59,909
Conversion of convertible preferred stock into common stock		$ (59,909)
Conversion of convertible preferred stock into common stock, Shares		(60,000,000)
Series B Convertible Preferred Stock
Statement [Line Items]
Convertible preferred stock, Beginning balance, Shares		40,000,000
Convertible preferred stock, Beginning balance		$ 79,761
Issuance of convertible preferred stock		$ 25,466
Issuance of convertible preferred stock, Shares		12,500,000
Conversion of convertible preferred stock into common stock		$ (105,227)
Conversion of convertible preferred stock into common stock, Shares		(52,500,000)
Common Stock
Statement [Line Items]
Beginning balance	$ 23	$ 2
Beginning balance, Shares	22,654,444	1,587,953
Conversion of convertible preferred stock into common stock		$ 16
Conversion of convertible preferred stock into common stock, Shares		16,071,418
Initial public offering, net of underwriting discounts, commissions and offering costs		$ 5
Initial public offering net of underwriting discounts, commissions and offering costs, Shares		4,500,000
Issuance of common stock under employee benefit plans, Shares	182,359	33,782
Vesting of restricted stock awards, Shares	525,352	461,291
Ending balance	$ 28	$ 23
Ending balance, Shares	27,941,566	22,654,444
Common Stock | Private Placement
Statement [Line Items]
Issuance of common stock, net of issuance costs	$ 4
Issuance of common stock, net of issuance costs, Shares	4,029,411
Common Stock | At-The-Market Offering
Statement [Line Items]
Issuance of common stock, net of issuance costs	$ 1
Issuance of common stock, net of issuance costs, Shares	550,000
Treasury Stock
Statement [Line Items]
Beginning balance, Shares		67,024
Repurchase of unvested restricted stock awards	29,882	61,450
Retirement of treasury shares	(29,882)	(128,474)
Additional Paid-In Capital
Statement [Line Items]
Beginning balance	$ 237,931	$ 4,452
Conversion of convertible preferred stock into common stock		165,120
Initial public offering, net of underwriting discounts, commissions and offering costs		63,867
Issuance of common stock under employee benefit plans	1,430	253
Vesting of restricted stock awards	15	15
Stock-based compensation expense	7,350	4,224
Ending balance	316,775	237,931
Additional Paid-In Capital | Private Placement
Statement [Line Items]
Issuance of common stock, net of issuance costs	64,314
Additional Paid-In Capital | At-The-Market Offering
Statement [Line Items]
Issuance of common stock, net of issuance costs	5,735
Accumulated other comprehensive loss
Statement [Line Items]
Unrealized loss on marketable securities	(2)
Ending balance	(2)
Accumulated Deficit
Statement [Line Items]
Beginning balance	(150,801)	(68,124)
Net loss	(70,819)	(82,677)
Ending balance	$ (221,620)	$ (150,801)