Note 13 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Cost of revenue	$	2,428	$	214	$	2,790	$	316
Sales and marketing		2,171		7,917		13,073		9,227
General and administrative		13,020		5,201		19,375		6,496
Research and development		15,057		49		15,237		196
Total stock-based compensation	$	32,676	$	13,381	$	50,475	$	16,235

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

	July 1,		September 1,
	2021		2021
Expected life (in years)	2.77			6.11
Expected volatility	43.25	%		43.31	%
Risk-free rate	0.37	%		0.94	%
Dividend yield	—			—

	July 1
	2021
Expected life (in years)		4.10
Expected volatility		34.44	%
Risk-free rate		0.79	%
Dividend yield		—