CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 24,631	$ 24,027		$ 19,926
Investment in marketable securities	297	4,981		41,590
Prepaid and other current assets	861	1,002		2,921
Total Current Assets	25,789	30,010		64,437
Non-current Assets:
Property and equipment, net	84	90		113
Non-current prepaid expenses and other assets	0	60		2,262
Total Non-current Assets	84	150		2,468
Total Assets	25,873	30,160		66,905
Current Liabilities:
Trade payables	261	1,041		2,707
Accrued expenses	889	941		9,272
Employee-related obligations	86	413		1,428
Total Current Liabilities	1,236	2,395		14,819
Total Liabilities	1,236	2,395		14,819
Commitments and Contingencies
Stockholders' Equity:
Preferred stock: $0.0001 par value; 20,000,000 shares authorized at March 31, 2026 and December 31, 2025; no shares issued and outstanding at March 31, 2026 and December 31, 2025
Common stock: $0.0001 par value; 150,000,000 shares authorized at March 31, 2026 and December 31, 2025; and 33,352,858 and 33,323,171 shares issued and outstanding at March 31, 2026 and December 31, 2025, respectively	3	3		1
Additional paid-in capital	785,872	785,413		783,235
Accumulated other comprehensive income	0	2		20
Accumulated deficit	(761,238)	(757,653)		(731,170)
Total Stockholders' Equity	24,637	27,765	$ 44,132	52,086	$ 88,735
Total Liabilities and Stockholders' Equity	$ 25,873	$ 30,160		$ 66,905

Carrying value as of the balance sheet date of obligations 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).

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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).