Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)	Total	Convertible preferred stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2017	$ (23,278,000)		$ 5,000	$ 1,522,000	$ (24,805,000)
Balance (in shares) at Dec. 31, 2017		5,653,000
Balance at Dec. 31, 2017		$ 28,715,000
Balance (in shares) at Dec. 31, 2017			3,745
Collection of stock subscription receivable		1,100,000
Issuance of Series C convertible preferred stock for cash, net of issuance costs	17,873,000	$ 16,773,000
Issuance of Series C convertible preferred stock for cash, net of issuance costs (in shares)		2,495
Exercise of stock options for cash	1,000			1,000
Exercise of stock options for cash (in shares)			2
Vesting related to repurchase liability	35,000			35,000
Issuance of restricted common shares	10,000			10,000
Issuance of restricted common shares, (in shares)			15
Stock-based compensation	180,000			180,000
Net loss	(6,579,000)				(6,579,000)
Balance at Dec. 31, 2018	(29,631,000)		$ 5,000	1,748,000	(31,384,000)
Balance (in shares) at Dec. 31, 2018		8,148,000
Balance at Dec. 31, 2018	$ 46,588,000	$ 46,588,000
Balance (in shares) at Dec. 31, 2018	3,762,000		3,762
Exercise of stock options for cash	$ 14,000		$ 19,000	14,000
Exercise of stock options for cash (in shares)	19,040
Exercise of warrants for cash	$ 1,000			1,000
Vesting related to repurchase liability	30,000			30,000
Issuance of common stock to former stockholders of GTx upon Merger	29,049,000		$ 2,000	29,047,000
Issuance of common stock to former stockholders of GTx upon Merger (in shares)			3,458
Conversion of convertible preferred stock into common stock upon Merger	46,588,000		$ 8,000	46,580,000
Conversion of convertible preferred stock into common stock upon merger (in shares)		(8,148)
Conversion of convertible preferred stock into common stock upon Merger		$ (46,588,000)
Conversion of convertible preferred stock into common stock upon Merger (in shares)			8,148
Reclassification of convertible preferred stock warrant	1,942,000			1,942,000
Stock-based compensation	507,000			507,000
Net loss	(34,188,000)				(34,188,000)
Balance at Dec. 31, 2019	$ 14,312,000		$ 15,000	$ 79,869,000	$ (65,572,000)
Balance (in shares) at Dec. 31, 2019		0
Balance (in shares) at Dec. 31, 2019	15,387,000		15,387