Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Series C Convertible Preferred Stock	Series D Convertible Preferred Stock	Series D-2 Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2019	$ (36,968)						$ 483	$ (37,451)
Temporary Equity, Balance, shares at Dec. 31, 2019	58,145,867	58,145,867
Temporary Equity, Balance at Dec. 31, 2019	$ 43,740	$ 43,740
Balance, shares at Dec. 31, 2019						1,351,380
Issuance of convertible preferred stock for cash, net of issuance costs			$ 27,989	$ 41,948
Issuance of convertible preferred stock for cash, net of issuance costs, shares			28,063,500	61,066,216
Convertible preferred stock issuance costs			$ (74)	$ (305)
Issuance of Series C convertible preferred stock upon release of escrow of acquisition-related contingent consideration			$ 3,500
Issuance of Series C convertible preferred stock upon release of escrow of acquisition-related contingent consideration, shares			3,500,000
Issuance of convertible preferred stock for deferred purchase price			$ 5,000	$ 3,846
Issuance of convertible preferred stock for deferred purchase price, shares			5,000,000	5,088,851
Issuance of common stock in exchange for services	112						112
Issuance of common stock in exchange for services, shares						36,200
Vesting of common shares issued to founders	1						1
Vesting of common shares issued to founders, shares						48,750
Vesting of common shares issued for licensing rights	1						1
Vesting of common shares issued for licensing rights, shares						111,667
Issuance of common stock upon exercise of stock options	156						156
Issuance of common stock upon exercise of stock options, shares						131,002
Vesting of early exercised stock options	12						12
Vesting of early exercised stock options, shares						34,623
Impact of spinoff of diagnostic services business	(24,557)							(24,557)
Stock-based compensation	840						840
Net loss	(37,138)							(37,138)
Ending Balance at Dec. 31, 2020	$ (97,541)						1,605	(99,146)
Temporary Equity, Balance, shares at Dec. 31, 2020	160,864,434	160,864,434
Temporary Equity, Balance at Dec. 31, 2020	$ 126,023	$ 126,023
Balance, shares at Dec. 31, 2020	1,713,622					1,713,622
Issuance of convertible preferred stock for cash, net of issuance costs					$ 73,763
Issuance of convertible preferred stock for cash, net of issuance costs, shares					86,775,740
Convertible preferred stock issuance costs					$ (94)
Issuance of Series D-2 convertible preferred stock for settlement of deferred purchase price					$ 6,144
Issuance of Series D-2 convertible preferred stock for settlement of deferred purchase price, shares					7,219,560
Reclassification of convertible preferred stock purchase right liability		$ 4,880
Conversion of convertible preferred stock into common stock at initial public offering	$ 210,810					$ 3	210,807
Temporary Equity, Conversion of convertible preferred stock into common stock at initial public offering, shares		(254,859,734)
Temporary Equity, Conversion of convertible preferred stock into common stock at initial public offering		$ (210,810)
Conversion of convertible preferred stock into common stock at initial public offering, shares						25,485,955
Issuance of shares of common stock in initial public offering for cash, net of issuance costs	199,792					$ 1	199,791
Issuance of shares of common stock in initial public offering for cash, net of issuance costs, shares						11,500,000
Reclassification of convertible preferred stock warrants	169						169
Issuance of common stock in exchange for services	725						725
Issuance of common stock in exchange for services, shares						28,850
Issuance costs related to initial public offering						$ 18,709
Issuance of common stock upon exercise of stock options	$ 237						237
Issuance of common stock upon exercise of stock options, shares	151,436					151,436
Issuance of common stock under employee stock purchase plan	$ 428						428
Issuance of common stock under employee stock purchase plan, shares						26,150
Vesting of early exercised stock options	32						32
Vesting of early exercised stock options, shares						37,097
Stock-based compensation	10,698						10,698
Net loss	(90,195)							(90,195)
Ending Balance at Dec. 31, 2021	$ 235,155					$ 4	$ 424,492	$ (189,341)
Temporary Equity, Balance, shares at Dec. 31, 2021	0
Balance, shares at Dec. 31, 2021	38,943,110					38,943,110