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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stockholders' Equity |
7. Stockholders’ Equity
Share-Based Compensation Our share-based compensation expense is associated with restricted stock units, or RSUs, performance stock units, or PSUs, and our Employee Stock Purchase Plan, or ESPP. The following table summarizes our share-based compensation expense included in our consolidated statements of operations for the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of sales | $ | 2.6 |  |  | $ | 4.1 |  |  | $ | 4.6 |  |  | $ | 6.0 |
Research and development | 11.1 |  |  | 9.8 |  |  | 21.5 |  |  | 18.0 |
Selling, general and administrative | 17.9 |  |  | 16.8 |  |  | 33.5 |  |  | 30.6 |
Total share-based compensation expense | $ | 31.6 |  |  | $ | 30.7 |  |  | $ | 59.6 |  |  | $ | 54.6 |
At June 30, 2021, unrecognized estimated compensation costs related to RSUs, PSUs and ESPP totaled $210.9 million and is expected to be recognized through 2024. Equity Award Activity The total vest date fair value of RSUs and PSUs that vested during the six months ended June 30, 2021 was $198.6 million and $29.5 million, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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