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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION On November 30, 2017, the Company’s stockholders approved the adoption of the 2017 Employee, Director and Consultant Equity Incentive Plan (as amended, the “2017 Plan”). The 2017 Plan allows the Company, under the direction of the Compensation Committee of the Board of Directors, to make grants of restricted and unrestricted stock awards to employees, consultants, and directors. Stockholders have approved amendments to the 2017 Plan increasing the shares available to grant. As of June 30, 2021, the Company has 3.6 million shares of common stock available for grant under the 2017 Plan. If an RSU awarded under the 2017 Plan is cancelled or forfeited without the issuance of shares of common stock, the unissued or reacquired shares that were subject to the RSU will again be available for issuance pursuant to the 2017 Plan. To the extent that awards outstanding under the Company's prior equity plans expire or are cancelled without delivery of shares of common stock, they also will be available for issuance pursuant to the 2017 Plan. The number of shares, terms, and vesting periods are generally determined by the Company’s Board of Directors or a committee thereof on an award-by-award basis. RSUs granted to employees generally vest ratably over four years either on the anniversary of the date on which the RSUs were granted or during the month in which such anniversary dates occur. The number of RSUs awarded to certain employees may be increased or reduced based on certain additional performance metrics. Options and RSUs granted to non-employee directors vest in full upon completion of one year of service on the anniversary following the date of the grant. Options generally vest ratably over service periods of four years. Options granted after December 5, 2012 expire eight years from the date of grant, and options granted prior to that date generally expire ten years from the date of grant. Stock Options 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 |
As of June 30, 2021, there was $3.4 million of total unrecognized stock-based compensation expense related to stock options that will be recognized over a weighted-average period of 2.1 years. Restricted Stock Units 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 |
As of June 30, 2021, there was $74.5 million of total unrecognized stock-based compensation expense related to RSUs that will be recognized over a weighted-average period of 2.5 years. Employee Stock Purchase Plan The Company also has an Employee Stock Purchase Plan that was approved by stockholders in 2012 (the “2012 Purchase Plan”), under which 2.0 million shares of common stock have been authorized. Shares are issued under the 2012 Purchase Plan twice yearly at the end of each offering period. As of June 30, 2021, approximately 0.1 million shares of common stock are available for issuance under the 2012 Purchase Plan. 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 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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