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Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Changes in Number of Shares Available for Grant

The following table summarizes changes in the number of shares available for grant under the Company’s equity incentive plans during the three-month period ended March 31, 2022 (unaudited):

		Number of shares
Available for grant at December 31, 2021			1,853,240
Added to 2019 Share Incentive Plan			1,320,000
RSUs granted			(8,606	)
Options granted			—
Shares withheld in settlement of taxes and/or exercise price			18,200
Forfeitures			4,916
Available for grant at March 31, 2022			3,187,750

Schedule of Total Share Based Compensation Expense

The following table shows total share-based compensation expense for the three-month periods ended March 31, 2021 and 2022 (unaudited and in thousands):

		Three Months Ended March 31,
		2021				2022
Cost of revenues		$	19			$	57
Research and development			517				1,022
Sales and marketing			295				627
General and administrative			579				714
Total share-based compensation expense		$	1,410			$	2,420

Summary of Stock Option Activity

The following is a summary of option activity for the Company’s share incentive plans for the three-month period ended March 31, 2022 (unaudited):

		Options				Weighted average exercise price				Weighted Average remaining contractual term (years)				Aggregate intrinsic value
Outstanding at December 31, 2021			2,797,992			$	12.64				7.9			$	38,295,799
Options granted			—			$	—				—			$	—
Options exercised			(14,268	)		$	10.23				—			$	—
Options forfeited			(750	)		$	12.00				—			$	—
Outstanding at March 31, 2022			2,782,974			$	12.66				7.7			$	32,758,640
Options exercisable at March 31, 2022			1,505,502			$	11.88				7.6			$	18,253,275
Options vested and expected to vest at March 31, 2022			2,740,776			$	12.64				7.7			$	32,237,845

Schedule of Estimated Fair Value of Weighted Average Assumptions

The fair value of options granted are estimated on the date of grant using the Black-Scholes option pricing model. The fair value of share options is being amortized on a straight-line basis over the requisite service period of the awards. The fair value of share options is estimated using the following weighted-average assumptions (unaudited):

		Three Months Ended March 31,
		2021				2022
Expected dividend yield			—				—
Risk-free interest rate			1.14	%		N/A
Weighted-average expected volatility			50.9	%		N/A
Expected term (in years)			6.5			N/A
Weighted average grant-date fair value per share of options granted		$	21.36			N/A

Summary of Restricted Shares Activity

The following is a summary of restricted shares activity for the Company’s share incentive plan for the three-month period ended March 31, 2022 (unaudited):

		Units				Weighted average grant date fair value
RSU balance at December 31, 2021			547,343			$	22.47
RSUs granted			8,606			$	23.80
RSUs vested			(93,854	)		$	28.98
RSUs forfeited			(4,166	)		$	40.25
RSU balance at March 31, 2022			457,929			$	21.00

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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