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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2023
Stockholders' Equity |
Summary of Restricted Stock Unit Activity | The following table summarizes RSU activity for the six months ended June 30, 2023 (number of units and aggregate intrinsic value in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted Average |  | Aggregate
​ | ​ | Units | ​ | Grant-Date Fair Value | ​ | Intrinsic Value
Units outstanding, beginning of year |  | 1,565 | ​ | $ | 145.38 |  | ​ |
Granted |  | 198 | ​ |  | 199.18 |  | ​ |
Released |  | (216) | ​ |  | 120.14 |  | ​ |
Forfeited |  | (77) | ​ |  | 156.58 |  | ​ |
Units outstanding, end of period |  | 1,470 | ​ |  | 155.74 | ​ | $ | 286,783
Summary of Performance Stock Unit Activity | The following table summarizes PSU activity, inclusive of XSUs, for the six months ended June 30, 2023 (number of units and aggregate intrinsic value in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted Average |  | Aggregate
​ | ​ | Units | ​ | Grant-Date Fair Value | ​ | Intrinsic Value
Units outstanding, beginning of year |  | 1,369 | ​ | $ | 43.43 |  | ​ |
Granted |  | — | ​ |  | — |  | ​ |
Released |  | (1,167) | ​ |  | 33.94 |  | ​ |
Forfeited |  | (43) | ​ |  | 26.75 |  | ​ |
Units outstanding, end of period |  | 159 | ​ |  | 117.67 | ​ | $ | 31,008
Summary of the Company's Stock Options Activity | The following table summarizes stock option activity for the six months ended June 30, 2023 (number of options and aggregate intrinsic value in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | Number | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | of | ​ | Exercise | ​ | Contractual | ​ | Aggregate
​ | ​ | Options | ​ | Price | ​ | Life (years) | ​ | Intrinsic Value
Options outstanding, beginning of year |  | 2,438 | ​ | $ | 28.58 |  |  |  | ​ |
Granted |  | — | ​ |  | — |  |  |  | ​ |
Exercised |  | (1,907) | ​ |  | 28.58 |  |  |  | ​ |
Expired / terminated |  | — | ​ |  | — |  | ​ |  | ​ |
Options outstanding and exercisable, end of period |  | 531 | ​ |  | 28.58 |  | 4.66 | ​ | $ | 88,421
Reported Share-Based Compensation | The following table summarizes the composition of stock-based compensation expense for the three and six months ended June 30, 2023 and 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Cost of product sales and service sales | ​ | $ | 1,678 | ​ | $ | 1,066 | ​ | $ | 2,998 | ​ | $ | 2,174
Sales, general and administrative expenses | ​ |  | 14,901 | ​ |  | 8,610 | ​ |  | 30,346 | ​ |  | 21,592
Research and development expenses | ​ |  | 15,312 | ​ |  | 11,486 | ​ |  | 32,897 | ​ |  | 22,484
Total stock-based compensation expense | ​ | $ | 31,891 | ​ | $ | 21,162 | ​ | $ | 66,241 | ​ | $ | 46,250

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