Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series A-1 Convertible Preferred Stock [Member]	Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Preferred Stock [Member] Series C Convertible Preferred Stock [Member]	Preferred Stock [Member] Series D Convertible Preferred Stock [Member]	Preferred Stock [Member] Series E Convertible Preferred Stock [Member]	Preferred Stock [Member] Convertible preferred stock	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2020	$ (46,200)	$ 1		$ 2,968	$ 15,484	$ 9,392	$ 16,589	$ 38,869		$ 4,714	$ (50,915)
Beginning Balance, shares at Dec. 31, 2020		906,000		4,819,000	2,788,000	1,588,000	2,224,000	7,392,000
Exercise of warrants and stock options to purchase common stock	81									81
Exercise of warrants and stock options to purchase common stock, shares		132,000
Vesting of early exercise of stock options, shares		1,000
Vesting of early exercise of stock options,Value	1									1
Issuance of common stock net of issuance costs	62,317	$ 1								62,316
Issuance of common stock net of issuance costs, shares		12,012,000
Issuance of common stock to fomer stockholders of Sunesis upon Merger	97,982									97,982
Issuance of common stock to fomer stockholders of Sunesis upon Merger, shares		5,173,000
Conversion of convertible preferred stock into common stock upon Merger	83,302	$ 2		$ (2,968)	$ (15,484)	$ (9,392)	$ (16,589)	$ (38,869)		83,300
Conversion of convertible preferred stock into common stock upon Merger, shares		18,812,000		(4,819,000)	(2,788,000)	(1,588,000)	(2,224,000)	(7,392,000)
Reclassification of preferred stock warrant liability to equity	396									396
Issuance of convertible preferred stock to former stockholders of Sunesis upon Merger	5,452								$ 5,452
Issuance of convertible preferred stock to former stockholders of Sunesis upon Merger, shares									10,000
Share-based compensation expense	644									644
Net loss	(79,231)										(79,231)
Ending Balance at Mar. 31, 2021	124,744	$ 4							$ 5,452	249,434	(130,146)
Ending Balance, shares at Mar. 31, 2021		37,036,000							10,000
Beginning Balance at Dec. 31, 2021	94,371	$ 4	$ 5,452							254,592	(165,677)
Beginning Balance, shares at Dec. 31, 2021		37,425	10
Exercise of warrants and stock options to purchase common stock	$ 7									$ 7
Exercise of warrants and stock options to purchase common stock, shares	7,000	7
Vesting of early exercise of stock options, shares	1	1								1
Vesting of restricted stock units, shares		53
Share-based compensation expense	$ 1,772									$ 1,772
Net loss	(10,546)										(10,546)
Ending Balance at Mar. 31, 2022	$ 85,605	$ 4	$ 5,452							$ 256,372	$ (176,223)
Ending Balance, shares at Mar. 31, 2022	0	37,486	10