Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 13,519	$ 35,078
Short-term investments	0	999
Prepaid expenses and other current assets	3,581	3,748
Other receivables	174	210
Total current assets	17,274	40,035
Non-current assets:
Right-of-use asset	187	603
Total assets	17,461	40,638
Current liabilities:
Accounts payable	1,455	890
Accrued expenses	4,920	5,858
Current portion of lease liability	130	282
Total current liabilities	6,505	7,030
Long-term liabilities:
Royalty obligation payable to Iowa Economic Development Authority	6,000	6,000
Lease liability	42	303
Total liabilities	12,547	13,333
Commitments and contingencies
Stockholders' equity:
Undesignated preferred stock, $0.01 par value: Authorized shares - 5,000,000 at September 30, 2024 and December 31, 2023; issued and outstanding shares - 0 at September 30, 2024 and December 31, 2023	0	0
Common stock, $0.01 par value: Authorized shares - 75,000,000 at September 30, 2024 and December 31, 2023; issued shares - 8,679,053 and 8,125,728 at September 30, 2024 and December 31, 2023, respectively, and outstanding shares - 8,648,243 and 8,102,555 at September 30, 2024 and December 31, 2023, respectively	86	81
Treasury stock, at cost, 30,810 and 23,173 shares at September 30, 2024 and December 31, 2023, respectively	(215)	(196)
Additional paid-in capital	192,019	188,937
Accumulated deficit	(186,976)	(161,517)
Total stockholders' equity	4,914	27,305
Total liabilities and stockholders' equity	$ 17,461	$ 40,638