CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Royalties	$ 163	$ 108	$ 368	$ 191
Costs and expenses:
Research and development	9,493	8,020	17,501	17,072
Selling, general and administrative	3,215	4,296	6,345	7,379
Total operating expenses	12,708	12,316	23,846	24,451
Loss from operations	(12,545)	(12,208)	(23,478)	(24,260)
Interest income, net	805	1,053	1,731	1,993
Other income (expense), net	(38)	5	(42)	(106)
Total other income (expense), net	767	1,058	1,689	1,887
Net loss	(11,778)	(11,150)	(21,789)	(22,373)
Preferred stock dividend payable on Series A Convertible Preferred Stock	(6)	(6)	(12)	(12)
Net loss attributable to common stockholders	$ (11,784)	$ (11,156)	$ (21,801)	$ (22,385)
Net loss per common share - basic (in dollars per share)	$ (0.26)	$ (0.25)	$ (0.49)	$ (0.50)
Net loss per common share - diluted (in dollars per share)	$ (0.26)	$ (0.25)	$ (0.49)	$ (0.50)
Weighted-average shares outstanding - basic (in shares)	44,825	44,677	44,752	44,677
Weighted-average shares outstanding - diluted (in shares)	44,825	44,677	44,752	44,677

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.