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Note 13 - Stock-based Compensation | 3 Months Ended
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Mar. 31, 2023
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 13. Stock-Based Compensation The Company previously maintained the 2006 Equity Incentive Plan (the “2006 Plan”) and the 2016 Equity Incentive Plan (the "2016 Plan"). Under both the 2006 Plan and the 2016 Plan, the Company granted incentive stock options, non-qualified stock options and restricted stock to eligible recipients which included employees, directors and consultants. On May 27, 2021, the Company’s Board of Directors approved the 2021 Equity Incentive Plan (the “2021 Plan”), which succeeded the 2016 Plan. As of the adoption of the 2021 Plan, all equity awards are granted under the 2021 Plan and no equity is granted under the 2016 Plan, or, for avoidance of doubt, the 2006 Plan. As of March 31, 2023, 22,573,555 shares remained for future issuance under the 2021 Plan. All outstanding stock awards granted under the 2006 Plan and 2016 Plan will remain subject to the terms and conditions of the 2006 Plan and 2016 Plan, respectively, and the provisions of any award agreements made thereunder. To date, the Company has issued only stock options, restricted stock and restricted stock units to employees, directors and consultants. The Company records stock-based compensation in cost of revenue, sales and marketing, general and administrative and research and development. Stock-based compensation was included in the following line items:
|  | Three Months Ended March 31, |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Cost of revenue |  | $ | 670 |  |  | $ | 578 |
Sales and marketing |  |  | 2,201 |  |  |  | 2,462 |
General and administrative |  |  | 4,382 |  |  |  | 4,484 |
Research and development |  |  | 851 |  |  |  | 750 |
Total stock-based compensation |  | $ | 8,104 |  |  | $ | 8,274 |
Stock Options The compensation costs for stock option awards are accounted for in accordance with ASC 718. Stock options vest over a four-year service period and expire on the tenth anniversary of the date of award. On March 13, 2023, the Company granted 1,125,374 options under the 2021 Plan. The Company estimated the grant date fair value of these stock options using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | March 13, |
|  | 2023 |
Expected life (in years) |  |  | 6.11 |
Expected volatility |  |  | 59.19 | %
Risk-free rate |  |  | 3.63 | %
Dividend yield |  |  | — |
To estimate the expected life of stock options, the Company considered the vesting term, contractual expiration period, and market conditions. Expected volatility is based on historical volatility of a group of peer entities. Dividend yields are based upon historical dividend yields. Risk-free interest rates are based on the implied yields currently available on U.S. Treasury zero coupon issues with a remaining term equal to the expected life. Based on these inputs, the grant-date fair value was determined to be $2.8 million. As of March 31, 2023, there was $25.0 million in unrecognized compensation costs related to all unvested awards. As of March 31, 2023, the Company had 29,436,670 options outstanding and 20,229,958 options exercisable with intrinsic values of $32.3 million and $31.4 million, respectively. During the three months ended March 31, 2023, 680,385 options were exercised, with a total intrinsic value of $2.0 million. Restricted Stock Units 6,349,464 RSUs were granted under the 2021 Plan during the three months ended March 31, 2023, with a weighted-average grant date fair-value of $4.22 per RSU. The compensation costs for RSUs are accounted for in accordance with ASC 718. RSUs vest over a four-year service period from the grant date. The RSUs are measured at the fair market value of the underlying stock at the grant date. As of March 31, 2023, there was $73.2 million in unrecognized compensation costs specific to the unvested RSUs under the 2021 Plan. Company Earn-Out RSUs The compensation costs for Company Earn-Out RSUs are accounted for in accordance with ASC 718. In order to capture the market conditions associated with the Company Earn-Out RSUs, the Company applied an approach that incorporated a Monte Carlo simulation, which involved random iterations that took different future price paths over the Sponsor Earn-Out RSUs’ contractual life based on the appropriate probability distributions. The fair value was determined by taking the average of the fair values under each Monte Carlo simulation trial. Under this approach, the grant-date fair value of the Company Earn-Out RSUs on July 1, 2021, was determined to be $2.5 million. The stock options underlying the Earn-Out RSUs vest over a four-year period and expire on the tenth anniversary of the date of award. If the contingent milestones of the Earn-Out RSUs are not met by the seventh anniversary of the Apex Business Combination, the holders of the underlying stock options will not receive the Earn-Out RSUs.

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