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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | A summary of option activity under the Company's equity plans, including the Company's inducement awards, is as follows for the year ended December 31, 2021:
(number of shares in millions) | Number of shares |  | Weighted average exercise price |  | Weighted average remaining contractual life (years)
Options outstanding at beginning of period | 5.2 |  |  | $ | 23.24 |  |  |
Options granted | — |  |  | — |  |  |
Less: |  |  |  |  |
Options exercised | (3.7) |  |  | 24.26 |  |  |
Options canceled or expired | (0.1) |  |  | 25.18 |  |  |
Options outstanding at end of period | 1.4 |  |  | 20.36 |  |  | 3.08
Options exercisable at end of period | 1.0 |  |  | 23.07 |  |  | 2.09
Options vested and expected to vest | 1.4 |  |  | 20.36 |  |  | 3.08
Summary of Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2021 (number of shares in millions):
|  | Options outstanding
Range of exercise prices |  | Number outstanding at December 31, 2021 |  | Weighted average remaining contractual life (years) |  | Weighted average exercise price
$13.38 |  | 0.7 |  |  | 5.62 |  | $ | 13.38 |
$23.98 |  | 0.1 |  |  | 0.18 |  | 23.98 |
$27.07 - 36.55 |  | 0.6 |  |  | 0.74 |  | 27.25 |
|  | 1.4 |  |  | 3.08 |  | $ | 20.38 |
Schedule of Restricted Stock Units Activity | A summary of the RSU activity under the Company's equity plans, including the Company's inducement awards and RSU awards with performance metrics, is as follows for the year ended December 31, 2021:
| 2021
(number of shares in millions) | Number of shares |  | Weighted average grant date fair value
RSUs unvested and outstanding at beginning of period | 3.2 |  |  | $ | 20.56 |
RSUs granted | 1.8 |  |  | 29.83 |
Less: |  |  |
RSUs vested | (1.1) |  |  | 21.32 |
RSUs canceled | (0.8) |  |  | 24.48 |
RSUs unvested and outstanding at end of period | 3.1 |  |  | $ | 24.96 |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense recognized and included in the Consolidated Statements of Operations was allocated as follows:
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2020 |  | 2019
Cost of molecular diagnostic testing | $ | 1.5 |  |  | $ | 0.6 |  |  | $ | 1.2 |  |  | $ | 0.8 |
Cost of pharmaceutical and clinical services | 0.1 |  |  | 0.1 |  |  | 0.3 |  |  | 0.2 |
Research and development expense | 4.2 |  |  | 2.4 |  |  | 5.0 |  |  | 5.4 |
Selling, general, and administrative expense | 30.5 |  |  | 11.8 |  |  | 18.7 |  |  | 27.1 |
Total stock-based compensation expense | $ | 36.3 |  |  | $ | 14.9 |  |  | $ | 25.2 |  |  | $ | 33.5 |
Schedule of Aggregate Intrinsic Value | The aggregate intrinsic value of options outstanding, aggregate intrinsic value of options that are fully vested and aggregate intrinsic value of RSUs vested and expected to vest is as follows:
(in millions) | As of December 31, 2021
Aggregate intrinsic value of options outstanding | $ | 10.2 |
Aggregate intrinsic value of options fully vested | 4.6 |
Aggregate intrinsic value of RSUs outstanding | 86.3 |
Schedule of Intrinsic Value of Options Exercised | The total intrinsic value of options exercised was as follows:
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2020 |  | 2019
Total intrinsic value of options exercised | $ | 29.2 |  |  | $ | 0.5 |  |  | $ | 8.8 |  |  | $ | 0.4 |
Schedule of Shares Purchased and Compensation Expenses for ESPP | Shares purchased under and compensation expense associated with the 2012 Purchase Plan for the years reported are as follows:
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2020 |  | 2019
Shares purchased under the plans | 0.2 |  |  | 0.1 |  |  | 0.3 |  |  | 0.2 |
Plan compensation expense | $ | 1.5 |  |  | $ | 0.6 |  |  | $ | 1.7 |  |  | $ | 1.0 |
Schedule of Valuation Assumptions for ESPP | The fair value of shares issued under the Plan that was in effect for each period reported was calculated using the Black‑Scholes option-pricing model using the following weighted-average assumptions:
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
| 2021 |  | 2020 |  | 2020 |  | 2019
Risk-free interest rate | 0.1% |  | 0.2% |  | 1.8% |  | 2.1%
Expected dividend yield | —% |  | —% |  | —% |  | —%
Expected life (in years) | 0.5 |  | 0.5 |  | 0.5 |  | 0.5
Expected volatility | 60% |  | 94% |  | 99% |  | 55%

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