Note 3 - Business Combination (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block]

Common stock	$	31,789
Total	$	31,789

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

	As of February 13, 2018			2018 Adjustments			As of December 31, 2018
Cash and cash equivalents	$	25,525		$	—		$	25,525
Accounts receivable		14,666			—			14,666
Prepaid expenses		446			(10	)		436
Property and equipment		170			—			170
Intangible assets:
Developed technology (1)		22,400			(300	)		22,100
In-process research and development (2)		1,600			—			1,600
Total assets		64,807			(310	)		64,497
Accounts payable		(3,379	)		75			(3,304	)
Other current liabilities		(6,351	)		(393	)		(6,744	)
Liability related to sale of future royalties		(16,300	)		400			(15,900	)
Net assets acquired		38,777			(228	)		38,549
Purchase price		(31,789	)		—			(31,789	)
Bargain purchase gain (3)	$	6,988		$	(228	)	$	6,760