Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities
Net loss	$ (30,430)	$ (5,663)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	2,879	1,074
Depreciation and amortization	273	584
Gain on sale of priority review voucher	0	(6,300)
Loss on sale or disposal of fixed assets	14	0
Amortization of right-of-use assets and change in operating lease liability	(70)	0
In-process research and development charge	0	426
Benefit for deferred taxes	0	(9,500)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,086)	(731)
Other receivables	136	309
Accounts payable and accrued expenses	(1,364)	(3,196)
Net cash used in operating activities	(29,648)	(22,997)
Cash Flows From Investing Activities
Cash acquired in connection with merger	0	84,179
Proceeds from sale of priority review voucher, net	26,000	32,500
Purchase of equipment	(30)	(30)
Net cash provided by investing activities	25,970	116,649
Cash Flows From Financing Activities
Exercise of stock options	64	116
Sale of shares under stock purchase plans	6	24
Payment for tax withholding on vested awards	(114)	0
Costs of common stock offering under Controlled Equity OfferingSM	(148)	(38)
Principal payments on notes payable	0	(27)
Net cash provided by (used in) financing activities	(192)	75
Net increase (decrease) in cash and cash equivalents	(3,870)	93,727
Cash and cash equivalents at beginning of year	98,679	4,952
Cash and cash equivalents at end of year	94,809	98,679
Supplemental cash flow information:
Cash received for income taxes	0	4,473
Cash paid for interest	0	8
Supplemental non-cash investing and financing activity:
Conversion of preferred stock to common stock	0	64,186
Issuance of common stock to NewLink shareholders	0	116,949
Non-cash settlement of liability related to priority review voucher	$ 0	$ 35,720