Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

	2019		2018		2017
Product sales	$	1,559	$	-	$	-
Royalty income		16,970		14,908		10,965
License and other revenue		16,457		714		733
Total revenue	$	34,986	$	15,622	$	11,698

Schedule of Estimated Useful Lives of Fixed Assets [Table Text Block]

Computer equipment (in years)		3
Machinery and equipment (in years)		5
Furniture and fixtures (in years)		5
Leasehold improvements	Earlier of life of improvement or lease

Deferred Lease [Table Text Block]

	2018
Other current liabilities:
Deferred lease incentive	$	26
Other liabilities:
Deferred lease liability	$	1,541
Deferred lease incentive	$	277