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v3.23.2

Equity Incentive Plans and Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Stock compensation plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares available for issuance | 11,407,453 |  | 11,407,453 |  | 7,655,769
Contingently issuable ESPP shares |  |  |  |  |
Stock-based compensation |  |  |  |  |
Employee stock purchase plan, shares issued during period |  |  | 120,569 | 161,254 |
Employee stock purchase plans, weighted average price per share |  |  | $ 27.91 | $ 19.97 |
Shares available for issuance | 2,400,000 |  | 2,400,000 |  |
Discount from the fair market value (as a percentage) |  |  | 15.00% |  |
Stock-based compensation expense | $ 0.4 | $ 0.4 | $ 1.0 | $ 0.8 |
Unrecognized compensation cost | 0.6 |  | $ 0.6 |  |
Unrecognized compensation cost, weighted-average period |  |  | 4 months |  |
Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost | 0.1 |  | $ 0.1 |  |
Unrecognized compensation cost, weighted-average period |  |  | 3 months 18 days |  |
Nonvested equity stock units and stock units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock-based compensation expense | 10.9 | $ 8.2 | $ 23.4 | $ 15.5 |
Unrecognized compensation cost | $ 86.9 |  | $ 86.9 |  |
Unrecognized compensation cost, weighted-average period |  |  | 2 years 3 months 18 days |  |
Awards, nonvested grants in period, shares | 100,000 | 100,000 | 1,174,026 | 1,700,000 |
Requisite service period | 4 years | 4 years | 4 years | 4 years |
Awards, nonvested grants in period, fair value | $ 2.5 | $ 4.3 | $ 55.2 | $ 48.9 |
Nonvested equity stock units and stock units | Director |  |  |  |  |
Stock-based compensation |  |  |  |  |
Requisite service period | 1 year | 1 year | 1 year | 1 year |
Nonvested equity stock units and stock units | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Awards, vesting rights (as a percentage) |  |  | 0.00% | 0.00% |
Nonvested equity stock units and stock units | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Awards, vesting rights (as a percentage) |  |  | 200.00% | 200.00% |

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