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Equity incentive plans (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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