Consolidated Statement of Changes in Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Preferred Stock Series A redeemable convertible preferred stock	Preferred Stock Series B redeemable convertible preferred stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at beginning of period (in shares) at Dec. 31, 2019		978,849	1,989,616	1,177,933	176,623
Balance at beginning of period at Dec. 31, 2019	$ (59,463)	$ 21,904	$ 41,631	$ 12	$ 0	$ 202	$ (59,677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accretion of preferred stock to current redemption value (pre-merger)	(651)	$ 216	$ 435				(651)
Issuance of common stock to former stockholders of NewLink upon merger (in shares)				4,146,405
Issuance of common stock to former stockholders of NewLink upon merger	116,949			$ 41		116,908
Cancellation of treasury stock upon merger (in shares)					(176,623)
Conversion of preferred stock into common stock upon merger (in shares)		(978,849)	(1,989,616)	2,968,465
Conversion of preferred stock into common stock upon merger	64,186	$ (22,120)	$ (42,066)	$ 30		64,156
Share-based compensation	1,074					1,074
Exercise of stock options (in shares)				10,533
Exercise of stock options	116					116
Sales of shares under stock purchase plan (in shares)				1,933
Sales of shares under stock purchase plan	24					24
Net loss	(5,663)						(5,663)
Balance at end of period (in shares) at Dec. 31, 2020		0	0	8,305,269	0
Balance at end of period at Dec. 31, 2020	116,572	$ 0	$ 0	$ 83	$ 0	182,480	(65,991)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,879					2,879
Exercise of stock options (in shares)				26,922
Exercise of stock options	64					64
Stock issued upon vesting of restricted stock units (in shares)				33,933
Stock issued upon vesting of restricted stock units	0
Shares surrendered for tax withholding on vested awards (in shares)				(9,428)	(9,428)
Shares surrendered for tax withholding on vested awards	(114)				$ (114)
Sales of shares under stock purchase plan (in shares)				695
Sales of shares under stock purchase plan	6					6
Net loss	(30,430)						(30,430)
Balance at end of period (in shares) at Dec. 31, 2021		0	0	8,357,391	9,428
Balance at end of period at Dec. 31, 2021	$ 88,977	$ 0	$ 0	$ 83	$ (114)	$ 185,429	$ (96,421)