Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025
Cash flows from operating activities
Net loss	$ (44,802)	$ (45,220)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	3,812	5,373
Amortization of operating lease right-of-use assets	3,180	3,529
Depreciation	884	1,348
Amortization (accretion) of premiums (discounts) on securities, net	(36)	(1,286)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(982)	149
Accounts payable	48	(71)
Accrued expenses and other liabilities	1,066	1,332
Operating lease liabilities	(3,277)	(3,475)
Net cash used in operating activities	(40,107)	(38,321)
Cash flows from investing activities
Proceeds from maturities of securities	76,596	74,241
Purchases of securities	(37,494)	(38,771)
Purchases of property and equipment	(2,409)	(1,033)
Net cash provided by investing activities	36,693	34,437
Cash flows from financing activities
Proceeds from exercise of stock options	1,233	26
Proceeds from issuance of common stock under employee stock purchase plan	142	87
Net cash provided by financing activities	1,375	113
Net decrease in cash, cash equivalents and restricted cash	(2,039)	(3,771)
Cash, cash equivalents and restricted cash at beginning of period	13,390	28,648
Cash, cash equivalents and restricted cash at end of period	11,351	24,877
Supplementary cash flow information on non-cash activities:
Acquisitions of property and equipment included in accounts payable and accrued expenses	$ 489	$ 51

Depreciation And Gain (Loss) On Disposal Of Assets

No definition available.

Name:	naut_DepreciationAndGainLossOnDisposalOfAssets
Namespace Prefix:	naut_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.