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Note 1 - Nature of the Business (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 01, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 30, 2020
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.0001		$ 0.0001		$ 0.0001	$ 0.0001
Operating Income (Loss)		$ (7,815)	$ (9,542)	$ (24,438)	$ (30,610)
Retained Earnings (Accumulated Deficit)		(268,574)		(268,574)		$ (242,723)
Cash, Cash Equivalents, and Short-Term Investments		14,600		14,600		$ 35,000
Net Cash Provided by (Used in) Operating Activities				(16,461)	$ (22,999)
Minimum Cash Balance For Loan Covenant				$ 5,000
ATM Facility [Member]
Proceeds from Issuance or Sale of Equity		2,100
Registered Direct Offering [Member] | Subsequent Event [Member]
Proceeds from Issuance or Sale of Equity	$ 3,500
Private Placement [Member]
Proceeds from Issuance or Sale of Equity		$ 3,800
Private Placement [Member] | Subsequent Event [Member]
Proceeds from Issuance or Sale of Equity	$ 3,800

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