Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based Compensation Expense

Total estimated stock-based compensation expense for employees and non-employees, related to all of the Company’s stock-based awards, was as follows:

	Three Months Ended
	March 31,
	2021		2020
	(in thousands)
Cost of revenue	$	397	$	58
Selling and marketing		331		199
Research and development		249		125
General and administrative		809		617
Total stock-based compensation	$	1,786	$	999

Stock Activity and Total Number of Shares Available for Grant

The following table presents the stock activity and the total number of shares available for grant as of March 31, 2021:

	(in thousands)
Balance at December 31, 2020		501
Options granted		(12	)
Options cancelled		6
Restricted stock granted		(88	)
Forfeited/Expired restricted stock added back		2
Balance at March 31, 2021		409

Stock Option Activity

	Options Outstanding
	Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)
Outstanding at December 31, 2020		2,383,427		$	7.85	$	7.78	$	33,064,942
Granted		11,550			27.20
Exercised		(158,544	)		5.75
Forfeited		(5,884	)		12.04
Outstanding at March 31, 2021		2,230,549		$	8.09		7.76	$	41,454,353
Vested and expected to vest at March 31, 2021		2,174,246		$	8.11		7.74	$	40,498,749
Exercisable at March 31, 2021		855,796		$	7.74		6.44	$	16,289,457

Schedule of Weighted-Average Assumptions

The following are the assumptions for options granted during the three months ended March 31, 2021

Expected term (in years)		6.1
Risk-free interest rate	0.5%- 1.1%
Expected volatility	59.6%- 59.8%
Dividend rate	0%

Restricted stock awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted Stock Activity

	Shares			Weighted Average Grant Date Fair Value Per Share
Nonvested restricted stock at December 31, 2020		677,590		$	9.71
Granted		87,746			21.60
Vested		(20,143	)		22.90
Shares forfeited		(2,139	)		12.14
Nonvested restricted stock at March 31, 2021		743,054		$	10.75