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Stock-Based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | Stock-based compensation expense before income tax expense for the three and nine-month periods ended September 30, 2025 and 2024 consisted of the following (in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of sales | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonqualified stock options | ​ | $ | 126 | ​ | $ | 150 | ​ | $ | 777 | ​ | $ | 875
Restricted stock units | ​ | ​ | 351 | ​ | ​ | — | ​ | ​ | 973 | ​ | ​ | —
Total cost of sales | ​ | ​ | 477 | ​ | ​ | 150 | ​ | ​ | 1,750 | ​ | ​ | 875
Research and development | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​
Nonqualified stock options | ​ | ​ | 328 | ​ |  | 440 | ​ | ​ | 965 | ​ |  | 1,221
Restricted stock units | ​ | ​ | 386 | ​ | ​ | — | ​ | ​ | 1,103 | ​ | ​ | —
Total research and development | ​ | ​ | 714 | ​ | ​ | 440 | ​ | ​ | 2,068 | ​ | ​ | 1,221
Selling, general and administrative | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​
Nonqualified stock options | ​ | ​ | 1,058 | ​ |  | 1,442 | ​ | ​ | 3,637 | ​ |  | 4,689
Performance-based restricted stock units | ​ | ​ | 8,030 | ​ | ​ | 2,884 | ​ | ​ | 16,588 | ​ | ​ | 7,648
Restricted stock units | ​ | ​ | 2,270 | ​ | ​ | 1,074 | ​ | ​ | 6,259 | ​ | ​ | 2,792
Cash-settled performance-based awards | ​ | ​ | 998 | ​ | ​ | 723 | ​ | ​ | 3,094 | ​ | ​ | 1,733
Cash-settled restricted stock units | ​ | ​ | 65 | ​ | ​ | — | ​ | ​ | 167 | ​ | ​ | —
Total selling, general and administrative | ​ | ​ | 12,421 | ​ | ​ | 6,123 | ​ | ​ | 29,745 | ​ | ​ | 16,862
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock-based compensation expense before taxes | ​ | $ | 13,612 | ​ | $ | 6,713 | ​ | $ | 33,563 | ​ | $ | 18,958
Performance-based restricted stock units |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended
​ | ​ | September 30,
​ | ​ | 2025 | ​ | 2024
Risk-free interest rate |  | 4.0% |  | 4.4%
Performance period |  | 2.8 years |  | 2.8 years
Expected dividend yield |  | — |  | —
Expected price volatility |  | 28.0% |  | 31.1%

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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