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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Stock-Based Compensation |
Stock-based compensation expense, by award | The Company recorded stock-based compensation expense as follows in the unaudited condensed consolidated statements of income and comprehensive income (dollars in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2020 |  | 2019
Stock options | ​ | $ | 0.4 | ​ | $ | 0.7
Restricted stock awards | ​ |  | — | ​ |  | 0.1
Restricted stock units | ​ | ​ | 2.6 | ​ | ​ | 1.9
Total stock-based compensation | ​ | $ | 3.0 | ​ | $ | 2.7
Stock-based compensation expense, cost allocation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2020 |  | 2019
Costs of product revenue | ​ | $ | 0.5 | ​ | $ | 0.4
Selling, general and administrative | ​ |  | 2.0 | ​ |  | 1.9
Research and development | ​ | ​ | 0.5 | ​ | ​ | 0.4
Total stock-based compensation | ​ | $ | 3.0 | ​ | $ | 2.7
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | Aggregate
​ | ​ | Shares Subject | ​ | Average | ​ | Contractual | ​ | Intrinsic Value
​ |  | to Options |  | Option Price |  | Term (Yrs) |  | (in millions) (b)
Outstanding at December 31, 2019 |  | 1,988,696 | ​ | $ | 23.43 | ​ | ​ | ​ | ​ | ​
Granted | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Exercised |  | (30,182) | ​ |  | 23.07 | ​ | ​ | ​ | ​ | ​
Forfeited/Expired |  | (3,113) | ​ |  | 22.84 | ​ | ​ | ​ | ​ | ​
Outstanding at March 31, 2020 |  | 1,955,401 | ​ | $ | 23.39 |  | 4.7 | ​ | $ | 25.4
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at March 31, 2020 |  | 1,515,278 | ​ | $ | 20.89 |  | 4.5 | ​ | $ | 22.7
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable and expected to vest at March 31, 2020 (a) |  | 1,919,442 | ​ | $ | 23.23 |  | 4.7 | ​ | $ | 25.2
(a) | In addition to the options that are vested at March 31, 2020, the Company expects a portion of the unvested options to vest in the future. Options expected to vest in the future are determined by applying an estimated forfeiture rate to the options that are unvested as of March 31, 2020.
(b) | The aggregate intrinsic value is based on the positive difference between the fair value of the Company’s common stock price of $35.86 on March 31, 2020 and the exercise price of the underlying stock options.
Restricted stock awards |
Stock-Based Compensation |
Schedule of restricted stock unit activity | Restricted stock unit activity for the three months ended March 31, 2020 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average Grant
​ | ​ | Shares Subject | ​ | Date Fair
​ |  | to Restriction |  | Value
Outstanding at December 31, 2019 | ​ | 865,101 | ​ | $ | 34.73
Granted | ​ | 23,859 | ​ | ​ | 50.70
Vested |  | (41,738) | ​ |  | 30.40
Forfeited | ​ | (21,845) | ​ | ​ | 32.65
Outstanding at March 31, 2020 |  | 825,377 | ​ | $ | 35.46
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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=116856206&loc=d3e5070-113901 + Details
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