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Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedules of Percentage of Total Revenues and Accounts Receivable by Customer | The following table sets forth the percentages of total revenue or gross accounts receivable for customers that represent 10% or more of the respective amounts for the periods shown:
| Revenue |  | Gross Accounts Receivable
| Twelve Months Ended December 31, |  | As of December 31,
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018
Distributor A | 17 | % |  | 15 | % |  | 16 | % |  | 21 | % |  | 19 | %
Distributor B | 12 | % |  | 12 | % |  | 14 | % |  | * |  |  | 15 | %
Distributor C | 10 | % |  | * |  |  | * |  |  | * |  |  | * |
* Less than 10%
Schedule of Revenue Recognized as a Result of Changes in Contract Liability Balances | The table below shows revenue that we recognized as a result of changes in the contract liability balances in the periods shown.
| Twelve Months Ended December 31,
(In millions) | 2019 |  | 2018
Revenue recognized in the period from: |  |  |
Amounts included in contract liabilities at the beginning of the period | $ | 2.6 |  |  | $ | 1.9 |
Schedule of Basic and Diluted Net Income (Loss) Per Share | The following table sets forth the computation of basic and diluted net income (loss) per share for the periods shown.
|  | Twelve Months Ended December 31,
(In millions) |  | 2019 |  | 2018 |  | 2017
Net income (loss) |  | $ | 101.1 |  |  | $ | (127.1 | ) |  | $ | (50.2 | )
Net income (loss) per common share |  |  |  |  |  |
Basic |  | $ | 1.11 |  |  | $ | (1.44 | ) |  | $ | (0.58 | )
Diluted |  | $ | 1.10 |  |  | $ | (1.44 | ) |  | $ | (0.58 | )
Basic weighted average shares outstanding |  | 91.1 |  |  | 88.2 |  |  | 86.3 |
Dilutive potential common stock outstanding: |  |  |  |  |  |
Stock options and employee stock purchase plan |  | — |  |  | — |  |  | — |
Restricted stock units |  | 1.2 |  |  | — |  |  | — |
2023 Warrants |  | — |  |  | — |  |  | — |
2022 senior convertible notes |  | — |  |  | — |  |  | — |
2023 senior convertible notes |  | — |  |  | — |  |  | — |
Diluted weighted average shares outstanding |  | 92.3 |  |  | 88.2 |  |  | 86.3 |
Schedule of Outstanding Anti-Dilutive Securities Excluded in Diluted Net Income (Loss) per Share | Outstanding anti-dilutive securities not included in the diluted net income (loss) per share attributable to common stockholders calculations were as follows:
| Twelve Months Ended December 31,
(In millions) | 2019 |  | 2018 |  | 2017
Options outstanding to purchase common stock | — |  |  | 0.1 |  |  | 0.4 |
Unvested restricted stock units | 0.2 |  |  | 2.7 |  |  | 2.7 |
2023 Warrants | 5.2 |  |  | 5.2 |  |  | — |
Senior convertible notes due 2022 | 4.0 |  |  | 4.0 |  |  | 4.0 |
Senior convertible notes due 2023 | 5.2 |  |  | 5.2 |  |  | — |
Total | 14.6 |  |  | 17.2 |  |  | 7.1 |

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