Note 11 - Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
United States federal tax at statutory rate	$ (12,774)	$ (33,038)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
State taxes (net of deferred benefit)	$ (1,768)	$ (4,778)
State taxes (net of deferred benefit), percent	2.90%	3.00%
Nondeductible expenses	$ 719	$ 709
Nondeductible expenses, percent	(1.20%)	(0.50%)
Change in fair market value of contingent consideration	$ 717	$ (2,342)
Change in fair market value of contingent consideration, percent	(1.20%)	1.50%
Warrant remeasurement and financing costs	$ 82	$ (551)
Warrant remeasurement and financing costs, percent	(0.10%)	0.40%
Research & Development credits	$ (542)	$ (743)
Research & Development credits, percent	0.90%	0.50%
Change in unrecognized tax benefits	$ 108	$ 149
Change in unrecognized tax benefits, percent	(0.20%)	(0.10%)
Foreign tax rate differential	$ 1,589	$ 2,590
Foreign tax rate differential, percent	(2.60%)	(1.60%)
Goodwill and investment impairments	$ 0	$ (6,638)
Goodwill and investment impairments, percent	(0.00%)	4.20%
Change in enacted tax rates and other, net	$ 533	$ (253)
Change in enacted tax rates and other, net, percent	(0.90%)	0.20%
Change in valuation allowance	$ 9,820	$ 41,771
Change in valuation allowance, percent	(16.10%)	(26.60%)
Total income tax expense (benefit)	$ (1,516)	$ (3,124)
Income tax benefit, percent	2.50%	2.00%