Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 41,048	$ 43,483
Marketable securities	71,587	83,239
Prepaid expenses and other current assets	11,510	6,029
Total current assets	124,145	132,751
Property and equipment, net	231	353
Operating lease, right-of-use ("ROU") asset	6,507	6,731
Restricted cash	568	568
Total assets	131,451	140,403
Current liabilities:
Accounts payable	1,577	2,249
Accrued expenses	13,214	6,287
Operating lease obligations, current portion	109	338
Total current liabilities	14,900	8,874
Operating lease obligations, long-term portion	6,272	6,296
Total liabilities	21,172	15,170
Commitments and Contingencies
Stockholders' equity:
Common stock, $0.0001 par value: 300,000 shares authorized; 138,282 and 137,820 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	14	14
Additional paid-in-capital	491,391	489,692
Accumulated other comprehensive income	190	210
Accumulated deficit	(381,316)	(364,683)
Total stockholders' equity	110,279	125,233
Total liabilities and stockholders' equity	$ 131,451	$ 140,403

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).