Note 5 - Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	December 31, 2020		December 31, 2019
Cash at banks	$	66,865	$	13,511
Money market funds		60,005		15
Cash and cash equivalents	$	126,870	$	13,526

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	December 31, 2020		December 31, 2019
Royalties receivable	$	334	$	3,438
Customer service contracts – billed		—		181
Accounts receivable	$	334	$	3,619

Property, Plant and Equipment [Table Text Block]

	December 31, 2020			December 31, 2019
Laboratory equipment	$	1,759		$	537
Office and computer equipment		294			132
Total property and equipment		2,053			669
Less: accumulated depreciation		(573	)		(459	)
Property and equipment, net	$	1,480		$	210

Lessee, Operating Lease, Right-of-Use Assets [Table Text Block]

	December 31, 2020		December 31, 2019
Facilities	$	6,836	$	1,985
Office equipment		2		5
Right-of-use assets, net	$	6,838	$	1,990

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

	December 31, 2020			December 31, 2019
Purchased technology	$	20,300		$	22,100
Intellectual property		80			80
Total cost		20,380			22,180
Less accumulated amortization		(5,019	)		(5,087	)
Intangible assets, net	$	15,361		$	17,093

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

Year Ending December 31,	Amount
2021	$	1,732
2022		1,731
2023		1,732
2024		1,732
2025		1,731
Thereafter		6,703
Total	$	15,361

Schedule of Accrued Liabilities [Table Text Block]

	December 31, 2020		December 31, 2019
Accrued compensation	$	1,618	$	903
Accrued clinical and manufacturing expenses		1,772		3,228
Accrued professional and consulting services		777		2
Reserve for return of royalties		—		178
Other		632		254
Total	$	4,799	$	4,565