Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Current assets
Cash	$ 3,716,072	$ 5,220,654
Accounts receivable, net	43,725	296,866
Inventories	137,642	149,961
Investor receivable		50,000
Prepaid expenses and other current assets	431,915	349,293
Total current assets	4,329,354	6,066,774
Property and equipment, net	31,533	37,085
Deferred offering costs	225,000	225,000
Operating right of use asset	42,726	48,774
Goodwill	10,203,473	18,549,005
Total assets	14,832,086	24,926,638
Current liabilities
Accounts payable	1,532,885	1,757,695
Accrued expenses	279,121	341,881
Notes payable	247,196
Operating lease liability, current	24,415	24,412
Contingent warrant liabilities	24,978	26,590
Derivative liabilities	956,979	6,985,347
Total current liabilities	3,065,574	9,135,925
Operating lease liability, net of current portion	18,311	24,362
Total liabilities	3,083,885	9,160,287
Commitments and Contingencies
Stockholders’ equity
Common stock, $0.00001 par value, 250,000,000 shares authorized at March 31, 2026 and December 31, 2025; 2,755,184 and 312,028 shares issued at March 31, 2026 and December 31, 2025, respectively; 2,755,154 and 311,998 shares outstanding at March 31, 2026 and December 31, 2025, respectively	27	3
Additional paid-in capital	148,242,874	147,836,001
Treasury stock, at cost; 30 shares of common stock at March 31, 2026 and December 31, 2025	(625,791)	(625,791)
Accumulated deficit	(135,429,433)	(131,214,558)
Accumulated other comprehensive loss	(441,200)	(231,028)
Total stockholders’ equity	11,746,477	15,764,627
Total liabilities, convertible preferred stock, and stockholders’ equity	14,832,086	24,926,638
Series C Redeemable Preferred Stock
Current liabilities
Series C Redeemable Preferred Stock, $0.00001 par value, 10,000 shares authorized, 7 shares issued and outstanding at March 31, 2026 and December 31, 2025, respectively	1,724	1,724
Series D Preferred Stock
Stockholders’ equity
Preferred Stock, value issued
Series E Preferred Stock
Stockholders’ equity
Preferred Stock, value issued

Represents the amount of contingent warrant liabilities.

No definition available.

Name:	onco_ContingentWarrantLiabilities
Namespace Prefix:	onco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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).