Note 15 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	Year Ended December 31,
	2023		2022		2021
	(in thousands)
Cost of revenue	$	3,161	$	2,640	$	3,477
Sales and marketing		9,518		11,393		15,906
General and administrative		19,338		19,398		24,063
Research and development		4,031		3,787		16,062
Total stock-based compensation	$	36,048	$	37,218	$	59,508

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

	2023			2022			2021
Expected term (in years)	6.11				6.11			6.11
Expected volatility	59.19		%		45.18	%		43.31	%
Risk-free rate	3.63		%		2.16	%		0.94	%
Dividend yield		—			—			—

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

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Stock Options			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life
Balance, January 1, 2023		29,167,803		$	4.05		6.53
Granted		1,125,374			4.22		—
Exercised		(2,840,716	)		1.96		—
Forfeited or expired		(260,276	)		7.03		—
Balance, December 31, 2023		27,192,185		$	4.25		5.91

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

	Outstanding						Exercisable
Exercise Price	Stock Options		Weighted-Average Contractual Life		Weighted-Average Exercise Price		Stock Options		Weighted-Average Contractual Life		Weighted-Average Exercise Price
$ 0.16 - $ 1.34		5,401,719		2.68	$	1.28		5,401,719		2.68	$	1.28
$ 1.52 - $ 1.89		4,051,290		4.74		1.61		4,051,290		4.74		1.61
$ 3.90 - $ 9.64		17,739,176		7.16		5.75		11,785,430		6.93		5.44
		27,192,185		5.91	$	4.25		21,238,439		5.43	$	3.65

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Unvested Restricted Stock Units
	Number of Shares			Weighted-Average Grant-Date Fair Value
Unvested as of December 31, 2022		8,392,543		$	7.10
Granted		6,752,588			4.38
Vested		(3,253,130	)		7.02
Forfeited		(1,189,412	)		5.94
Unvested as of December 31, 2023		10,702,589		$	5.54