Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Year Ended December 31,
	2021		2020		2019
	(in thousands)
Cost of revenue	$	3,477	$	592	$	415
Sales and marketing		15,906		19,973		8,166
General and administrative		24,063		12,916		5,034
Research and development		16,062		286		278
Total stock-based compensation	$	59,508	$	33,767	$	13,893

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

	July 1,		September 1,
	2021		2021
Expected term (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 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]

	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life		Aggregate Intrinsic Value
	(Aggregate Intrinsic Value figure presented in thousands)
Balance, January 1, 2019		23,326,692			0.96		6.12		—
Options granted		5,333,452			1.52		—		—
Options exercised		(451,953	)		0.19		—		—
Options forfeited or expired		(2,501,900	)		0.70		—		—
Balance, December 31, 2019		24,926,640			1.13		6.42		—
Options granted		11,537,242			3.91		—		—
Options exercised		(707,888	)		0.77		—		—
Options forfeited or expired		(898,926	)		1.32		—		—
Balance, December 31, 2020		34,857,068			2.05		6.89		—
Options granted		5,611,658			9.64		—		—
Options exercised		(5,141,331	)		1.08		—		—
Options forfeited or expired		(4,847,078	)		0.44		—		—
Balance, December 31, 2021		30,480,317		$	3.87		2.83	$	92,600

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
$ 0.03 - $ 1.34		6,634,833		4.69	$	1.28		6,634,833		4.69	$	1.28
$ 1.52 - $ 1.89		6,879,874		5.84		1.59		5,195,211		5.46		1.59
$ 3.90 - $ 9.64		16,965,610		8.96		5.80		3,545,801		8.61		3.90
		30,480,317		7.33	$	3.87		15,375,845		5.85	$	1.99