Note 4 - Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

	Amortized		Gross Unrealized					Estimated		Cash and Cash		Short-Term		Long-Term
	Cost		Gains		Losses			Fair Value		Equivalents		Investments		Investments
June 30, 2022
Cash at banks	$	21,833	$	—	$	—		$	21,833	$	21,833	$	—	$	—
Money market funds		69,635		—		—			69,635		69,635		—		—
U.S. Treasury securities		20,057		—		(284	)		19,773		—		19,773		—
Commercial paper		12,638		—		(57	)		12,581		—		10,641		1,940
Corporate debt securities		7,732		—		(68	)		7,664		—		7,664		—
Total	$	131,895	$	—	$	(409	)	$	131,486	$	91,468	$	38,078	$	1,940

	Amortized		Gross Unrealized					Estimated		Cash and Cash		Short-Term		Long-Term
	Cost		Gains		Losses			Fair Value		Equivalents		Investments		Investments
December 31, 2021
Cash at banks	$	72,767	$	—	$	—		$	72,767	$	72,767	$	—	$	—
Money market funds		70,978		—		—			70,978		70,978		—		—
U.S. Treasury securities		25,055		—		(58	)		24,997		—		12,022		12,975
Commercial paper		7,491		—		—			7,491		—		7,491		—
Corporate debt securities		6,480		—		(16	)		6,464		—		3,229		3,235
Total	$	182,771	$	—	$	(74	)	$	182,697	$	143,745	$	22,742	$	16,210

Property, Plant and Equipment [Table Text Block]

	June 30, 2022			December 31, 2021
Laboratory equipment	$	6,862		$	5,057
Office and computer equipment		714			481
Leasehold improvements		1,063			1,063
Construction in progress		2,819			1,305
Total property and equipment		11,458			7,906
Less: accumulated depreciation		(2,122	)		(1,305	)
Property and equipment, net	$	9,336		$	6,601

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	June 30, 2022			December 31, 2021
Developed technology	$	10,600		$	10,600
Intellectual property		80			80
Total cost		10,680			10,680
Less: accumulated amortization		(731	)		(56	)
Intangible assets, net	$	9,949		$	10,624

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year Ending December 31,	Amount
2022 (six months remaining)	$	675
2023		1,350
2024		1,350
2025		1,350
2026		1,350
Thereafter		3,874
Total	$	9,949

Schedule of Accrued Liabilities [Table Text Block]

	June 30, 2022		December 31, 2021
Accrued compensation	$	3,200	$	2,786
Accrued clinical and manufacturing expenses		913		986
Accrued professional and consulting services		907		556
Accrued litigation settlement		2,000		—
Other liabilities, current portion		1,420		736
Total	$	8,440	$	5,064