Note 14 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

(in thousands)	2019			2018
Domestic (United Kingdom)	$	(8,368	)	$	12,623
Foreign (United States)		4,611			(37,404	)
Loss from continuing operations before income taxes	$	(3,757	)	$	(24,781	)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

(in thousands)	2019			2018
Current:
Federal	$	—		$	—
U.K.		1,401			(532	)
Japan		(78	)		(45	)
China		(46	)		(13	)
State		(119	)		—
Total current provision		1,158			(590	)
Deferred:
Federal		1,515			30,665
U.K.		(896	)		(1,343	)
Japan		85			—
State		555			8,554
Total deferred benefit		1,259			37,876
Income tax benefit from continuing operations	$	2,417		$	37,286

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2019			2018
Income tax rate		19.0	%		19.0	%
U.K. research and development credit		16.2			1.8
Permanent items		(6.1	)		1.0
Prior period adjustments		5.9			(5.2	)
State taxes		(19.0	)		9.2
Other		(0.4	)		2.0
Effect of foreign tax rate differential		(3.4	)		2.9
Uncertain tax positions		2.5			(1.7	)
Valuation allowance		49.6			121.5
Effective income tax rate		64.3	%		150.5	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

(in thousands)	2019			2018
Deferred tax assets:
U.S. federal net operating losses	$	11,410		$	11,478
State net operating losses (net of federal)		2,234			2,865
U.S. federal research and development credits		948			849
U.K. net operating losses		1,132			496
Share options		1,742			1,724
Accrued liabilities		406			1,052
Operating lease liabilities		101			—
State credits		536			512
Other		99			136
Total deferred tax assets		18,608			19,112
Valuation allowance		(16,127	)		(17,991	)
Total deferred tax assets	$	2,481		$	1,121
Deferred tax liabilities:
Intangibles	$	(24	)	$	—
Operating lease right-of-use assets		(113	)		—
Depreciation		(118	)		—
Other assets		(63	)		(69	)
Total deferred tax liabilities	$	(318	)	$	(69	)

Summary of Valuation Allowance [Table Text Block]

(in thousands)	2019			2018
Beginning of year (January 1)	$	17,991		$	48,098
Decrease in valuation allowance		(1,864	)		(30,107	)
End of year (December 31)	$	16,127		$	17,991

Summary of Income Tax Contingencies [Table Text Block]

Balance at December 31, 2018	$	372
Settlement/decreases related to tax positions taken during prior years		(372	)
Increases related to tax positions taken during prior years		—
Increases related to tax positions taken during the current year		—
Balance at December 31, 2019	$	—