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Equity incentive plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Option Activity

The following is a summary of activity for stock options under the Equity Incentive Plans (amounts in thousands, except share and per share amounts):

			Options Outstanding						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Balance - December 31, 2020			18,532,979						$	5.12					8.46						$	123,166
Granted			5,529,439						21.97
Exercised			(2,923,761)						3.75
Canceled			(1,196,398)						10.02
Balance - December 31, 2021			19,942,259						$	9.70					8.14						$	226,350
Vested & Expected to Vest as of December 31, 2021			19,942,259						$	9.70					8.14						$	226,350
Exerciseable as of December 31, 2021			8,002,666						$	4.77					7.41						$	118,769

Schedule of Weighted Average Assumptions, Options

The calculation of grant date fair value of stock options was based on the following weighted average assumptions:

			Fiscal Year Ended December 31,
			2021						2020						2019
Risk-free interest rate			1.0%						0.5%						2.2%
Expected volatility			60.5%						57.3%						48.1%
Expected life (in years)			6.0						5.9						6.0
Expected dividend yield			—%						—%						—%

Summary of Stock Appreciation Rights

The following is a summary of activity for SARs under the Equity Incentive Plans (amounts in thousands, except share and per share amounts):

			SARs Outstanding						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Balance - December 31, 2020			95,475						$	5.64					9.00						$	586
Granted			17,755						22.56
Exercised			(458)						3.12
Canceled			(6,617)						6.04
Balance - December 31, 2021			106,155						$	8.45					8.25						$	1,267
Vested & Expected to Vest as of December 31, 2021			106,155						$	8.45					8.25						$	1,267
Exercisable as of December 31, 2021			48,560						$	5.34					7.90						$	690

Schedule of Weighted Average Assumptions, SARs

The calculation of grant date fair value of SARs was based on the following weighted average assumptions:

			Fiscal Year Ended December 31,
			2021						2020						2019
Risk-free interest rate			1.5%						0.7%						1.9%
Expected volatility			60.9%						58.3%						54.3%
Expected life (in years)			6.2						6.1						5.4
Expected dividend yield			—%						—%						—%

Schedule of Restricted Stock Unit Activity

A summary of RSU activity under the 2021 Plan is as follows (in thousands, except per share data):

			RSUs Outstanding						Weighted Average Grant Date Fair Value
Unvested - December 31, 2020			—						$	—
Granted			2,569,153						27.64
Released			—						—
Canceled			(24,102)						27.64
Unvested - December 31, 2021			2,545,051						$	27.64

Summary of Performance-Based Options

The following table summarizes the activities of Performance-Based Options under the 2010 Plan (amounts in thousands, except share and per share amounts):

			Performance-Based Options Outstanding						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Balance - December 31, 2020			400,000						$	10.12					9.60						$	660
Granted			—						—
Exercised			—						—
Canceled			—						—
Balance - December 31, 2021			400,000						$	10.12					8.60						$	3,768
Vested & Expected to Vest as of December 31, 2021			400,000						$	10.12					8.60						$	3,768
Exercisable as of December 31, 2021			2,083						$	3.06					6.58						$	34

Schedule of Weighted Average Assumptions, ESPP

The following table summarizes the weighted-average assumptions used in estimating the fair value of ESPP for the initial offering period using the Black-Scholes option-pricing model:

			Fiscal Year Ended December 31,
			2021
Risk-free interest rate			0.3%
Expected volatility			61.2%
Expected life (in years)			1.2
Expected dividend yield			—%

Schedule of Stock-Based Compensation Expense

Total stock-based compensation expense included in the consolidated statements of operations was as follows (in thousands):

			Fiscal Year Ended December 31,
			2021						2020						2019
Cost of revenue			$	1,623					$	418					$	299
Sales and marketing			8,637						7,518						3,001
Research and development			6,816						5,232						2,357
General and administrative			17,604						18,450						3,306
Total stock-based compensation expense			$	34,680					$	31,618					$	8,963

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