Consolidated Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Convertible preferred stock, beginning balance (in shares) at Dec. 31, 2018		45,374,836
Convertible preferred stock, beginning balance at Dec. 31, 2018		$ 210,520
Beginning balance (in shares) at Dec. 31, 2018			13,764,829
Beginning Balance at Dec. 31, 2018	$ (97,398)		$ 1	$ 17,078	$ (42)	$ (114,435)
Conversion of convertible preferred stock into common stock (in shares)		45,374,836	(45,374,836)
Conversion of convertible preferred stock into common stock	(210,521)	$ 210,520	$ (5)	(210,516)
Issuance of common stock upon initial public offering, net of issuance costs (in shares)			9,739,541
Issuance of common stock upon initial public offering, net of issuance costs	168,223		$ 1	168,222
Exercise of stock options (in shares)			180,287
Exercise of stock options	1,519			1,519
Purchase of common stock under employee stock purchase plan (in shares)			50,353
Purchase of common stock under employee stock purchase plan	798			798
Forfeiture/Cancellation of restricted common stock			(56,973)
Stock-based compensation	16,281			16,281
Unrealized gain (loss) on marketable securities	184				184
Net loss	(105,385)					(105,385)
Ending balance (in shares) at Dec. 31, 2019			69,052,873
Ending Balance at Dec. 31, 2019	194,743		$ 7	414,414	142	(219,820)
Issuance of common stock upon initial public offering, net of issuance costs (in shares)			9,602,500
Issuance of common stock upon initial public offering, net of issuance costs	224,511		$ 1	224,510
Exercise of stock options (in shares)			655,772
Exercise of stock options	6,331			6,331
Purchase of common stock under employee stock purchase plan (in shares)			86,870
Purchase of common stock under employee stock purchase plan	1,179			1,179
Forfeiture/Cancellation of restricted common stock			81,754
Stock-based compensation	30,522			30,522
Unrealized gain (loss) on marketable securities	472				472
Net loss	$ (190,228)					(190,228)
Ending balance (in shares) at Dec. 31, 2020	79,316,261		79,316,261
Ending Balance at Dec. 31, 2020	$ 267,530		$ 8	676,956	614	(410,048)
Exercise of stock options (in shares)			2,395,223
Exercise of stock options	28,530			28,530
Vesting of restricted stock units			156,420
Purchase of common stock under employee stock purchase plan (in shares)			136,331
Purchase of common stock under employee stock purchase plan	1,765			1,765
Forfeiture/Cancellation of restricted common stock			(18,043)
Stock-based compensation	40,785			40,785
Unrealized gain (loss) on marketable securities	(1,557)				(1,557)
Net loss	$ (36,329)					(36,329)
Ending balance (in shares) at Dec. 31, 2021	79,316,261		81,986,192
Ending Balance at Dec. 31, 2021	$ 300,724		$ 8	$ 748,036	$ (943)	$ (446,377)