CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 39,267	$ 15,116
Short-term investments	645,074	230,636
Other current assets (including $0 and $429 as of June 30, 2026 and December 31, 2025, respectively, from a related party)	55,061	20,514
Total current assets	739,402	266,266
Long-term investments	339,061	0
Other assets	16,666	14,140
Total assets	1,095,129	280,406
Current liabilities:
Accounts payable (including $456 and $137 as of June 30, 2026 and December 31, 2025, respectively, to a related party)	24,891	10,770
Accrued expenses (including $130 and $994 as of June 30, 2026 and December 31, 2025, respectively, to a related party)	23,388	22,271
Operating lease liabilities, current portion	22,706	20,495
Total current liabilities	70,985	53,536
Operating lease liabilities, less current portion	55,850	65,256
Liabilities related to the sales of future royalties, net	57,378	63,157
Other long-term liabilities	7,795	8,625
Total liabilities	192,008	190,574
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares designated or outstanding at June 30, 2026 or December 31, 2025, respectively	0	0
Common stock, $0.0001 par value; 390,000,000 shares authorized; 34,129,664 shares and 20,378,832 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively	3	2
Capital in excess of par value	4,750,686	3,850,099
Accumulated other comprehensive income (loss)	(1,756)	17
Accumulated deficit	(3,845,812)	(3,760,286)
Total stockholders' equity	903,121	89,832
Total liabilities and stockholders' equity	$ 1,095,129	$ 280,406

Liability related to sale of potential future royalties non current net of issuance costs.

No definition available.

Name:	nktr_LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrentNetOfIssuanceCosts
Namespace Prefix:	nktr_
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).