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v3.23.3

Equity Incentive Plans and Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Stock compensation plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares available for issuance | 11,913,792 |  | 11,913,792 |  | 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 | $ 0.5 | $ 0.4 | $ 1.5 | $ 1.2 |
Unrecognized compensation cost | 0.2 |  | $ 0.2 |  |
Unrecognized compensation cost, weighted-average period |  |  | 1 month |  |
Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost, weighted-average period |  |  | 1 month |  |
Nonvested equity stock units and stock units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock-based compensation expense | 9.5 | $ 8.5 | $ 32.9 | $ 24.0 |
Unrecognized compensation cost | $ 73.0 |  | $ 73.0 |  |
Unrecognized compensation cost, weighted-average period |  |  | 2 years 1 month 6 days |  |
Awards, nonvested grants in period, shares |  | 500,000 | 1,208,954 | 2,200,000 |
Requisite service period | 4 years | 4 years | 4 years | 4 years |
Awards, nonvested grants in period, fair value | $ 2.1 | $ 12.8 | $ 57.3 | $ 61.8 |
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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