Stock-Based Compensation (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Summary of Stock Based Compensation Expense

Stock-based compensation was included in the following line items:

	Three months ended March 31,
	2021		2020
	(in thousands)
Cost of revenue	$	90	$	(88	)
Sales and marketing		1,111		(200	)
General and administrative		1,991		288
Research and development		97		75
Total stock-based compensation	$	3,289	$	75

Stock-based compensation was included in the following line items:

	Year Ended December 31,
	2020		2019		2018
	(in thousands)
Cost of revenue	$	592	$	415	$	157
Sales and marketing		19,973		8,166		384
General and administrative		12,916		5,034		1,036
Research and development		286		278		143
Total stock-based compensation	$	33,767	$	13,893	$	1,720

Schedule of Stock Option Grant Using Black-Scholes Option Pricing Model With Assumptions

The fair values of Modified Options were estimated using a Black-Scholes option-pricing model with the following weighted-average assumptions at March 31, 2021 and December 31, 2020:

	March 31, 2021			December 31, 2020
Expected life		4.33 years			4.48 years
Expected volatility		44.02	%		42.97	%
Risk-free rate		0.78	%		0.37	%
Dividend yield		—			—

The fair values of stock options granted were estimated using a Black-Scholes option-pricing model with the following weighted-average assumptions:

	2020			2019			2018
Expected life		6.11 years			6.11 years			8.16 years
Expected volatility		43.52	%		36.93	%		62.48	%
Risk-free rate		0.41	%		2.59	%		2.82	%
Dividend yield		—			—			—

Schedule of Stock-based Compensation Arrangement

	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life		Aggregate Intrinsic Value
	(Aggregate Intrinsic Value figure presented in thousands)
Balance, January 1, 2018		2,601,775			8.49		6.27		—
Options granted		407,251			6.66		—		—
Options exercised		(57,351	)		1.69		—		—
Options forfeited or expired		(267,793	)		8.49		—		—
Balance, December 31, 2018		2,683,882			8.37		6.12		—
Options granted		613,647			13.17		—		—
Options exercised		(52,000	)		1.69		—		—
Options forfeited or expired		(236,084	)		6.12		—		—
Balance, December 31, 2019		2,867,966			9.80		6.42		—
Options granted		1,327,432			33.94		—		—
Options exercised		(81,447	)		6.67		—		—
Options forfeited or expired		(103,427	)		11.49		—		—
Balance, December 31, 2020		4,010,524		$	17.81		6.89	$	263,316

Schedule of Outstanding and Exercisable Stock Options

At December 31, 2020, the following table summarizes information about outstanding and exercisable stock options:

	Outstanding						Exercisable
Exercise Price	Stock Options		Weighted Average Contractual Life		Weighted Average Exercise Price		Stock Options		Weighted Average Contractual Life		Weighted Average Exercise Price
$ 0.29 - $ 1.69		446,200		6.50	$	0.39		—		—	$	—
$ 3.70 - $ 11.61		1,119,898		4.42		9.93		1,065,048		4.28		9.71
$ 13.24 - $ 33.94		2,364,126		8.22		25.11		635,189		5.45		13.81
		4,010,524		6.89	$	17.81		1,700,237		4.72	$	11.24

Modified Stock Options [Member]

Schedule of Stock Option Grant Using Black-Scholes Option Pricing Model With Assumptions

The fair values of Modified Options were estimated using a Black-Scholes option-pricing model with the following weighted-average assumptions at the modification date and at year end:

	December 31, 2020			December 31, 2019
Expected life		4.48 years			2.68 years
Expected volatility		42.97	%		36.40	%
Risk-free rate		0.37	%		1.66	%
Dividend yield		—			—