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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | A summary of the stock option activity under the Company’s equity plans and inducement awards, for the six months ended June 30, 2021 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Exercise Price
Options outstanding at December 31, 2020 | 5.2 |  |  | $ | 23.24 |
Options granted | — |  |  | $ | — |
Less: |  |  |
Options exercised | (2.1) |  |  | $ | 22.93 |
Options canceled or expired | (0.1) |  |  | $ | 24.81 |
Options outstanding at June 30, 2021 | 3.0 |  |  | $ | 23.42 |
Options exercisable at June 30, 2021 | 2.4 |  |  | $ | 26.25 |
Schedule of Restricted Stock Unit Activity | A summary of the RSU activity under the Company’s equity plans and inducement awards, including RSU awards with performance metrics, for the six months ended June 30, 2021 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Grant Date Fair Value
RSUs outstanding at December 31, 2020 | 3.2 |  |  | $ | 20.56 |
RSUs granted | 1.5 |  |  | $ | 29.89 |
Less: |  |  |
RSUs vested | (0.1) |  |  | $ | 18.88 |
RSUs canceled | (0.6) |  |  | $ | 24.54 |
RSUs outstanding at June 30, 2021 | 4.0 |  |  | $ | 23.72 |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense recognized and included in the Condensed Consolidated Statements of Operations and Comprehensive Loss was allocated as follows:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of molecular diagnostic testing | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.7 |  |  | $ | 0.7 |
Cost of pharmaceutical and clinical services | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.2 |
Research and development expense | 1.0 |  |  | 1.2 |  |  | 2.5 |  |  | 2.3 |
Selling, general, and administrative expense | 7.5 |  |  | 0.3 |  |  | 14.6 |  |  | 6.2 |
Total stock-based compensation expense | $ | 8.9 |  |  | $ | 1.9 |  |  | $ | 17.9 |  |  | $ | 9.4 |

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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=120381028&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=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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