Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets
Cash and cash equivalents	$ 31,718	$ 41,299
Restricted cash	110	110
Prepaid materials	3,013	3,081
Prepaid expenses and other current assets	1,827	1,128
Total current assets	36,668	45,618
Other assets	1,275	1,990
Total Assets	37,943	47,608
Current liabilities
Accounts payable	2,569	4,293
Accrued expenses	2,807	1,307
Payroll liabilities	943	1,558
Other current liabilities	1,138	1,097
Total current liabilities	7,457	8,255
Total Liabilities	7,457	8,255
Commitments and contingencies (Note 12)
Stockholders' equity
Convertible preferred stock - $0.001 par value; 10,000,000 shares authorized; 577 shares issued and outstanding as of March 31, 2026 and December 31, 2025	0	0
Common stock - $0.18 par value; 350,000,000 shares authorized; 8,611,361 shares issued and outstanding as of March 31, 2026 and December 31, 2025	1,550	1,550
Additional paid-in capital	286,562	285,840
Treasury stock, at cost; 88,003 shares of common stock at March 31, 2026 and December 31, 2025	(1,475)	(1,475)
Accumulated deficit	(256,151)	(246,562)
Total Stockholders' Equity	30,486	39,353
Total Liabilities and Stockholders' Equity	$ 37,943	$ 47,608

Prepaid materials.

No definition available.

Name:	atos_PrepaidMaterials
Namespace Prefix:	atos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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).