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Organization and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedules of Concentration of Risk, by Risk Factor | The following table sets forth the percentage of total revenues that the revenues of Distributor A and Distributor B represented for the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Distributor A | 17 | % |  | 17 | % |  | 16 | % |  | 15 | %
Distributor B | 13 | % |  | 15 | % |  | 12 | % |  | 14 | %
Contract with Customer, Asset and Liability | The table below shows revenue that we recognized as a result of changes in the contract liability balances in the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Revenue recognized in the period from: |  |  |  |  |  |  |
Amounts included in contract liabilities at the beginning of the period | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.6 |  |  | $ | 1.9 |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the computation of basic and diluted net income (loss) per share for the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Net income (loss) | $ | (10.5 | ) |  | $ | 30.2 |  |  | $ | (37.4 | ) |  | $ | 6.0 |
Net income (loss) per common share: |  |  |  |  |  |  |
Basic | $ | (0.12 | ) |  | $ | 0.34 |  |  | $ | (0.41 | ) |  | $ | 0.07 |
Diluted | $ | (0.12 | ) |  | $ | 0.34 |  |  | $ | (0.41 | ) |  | $ | 0.07 |
Basic weighted average shares outstanding | 91.1 |  |  | 88.2 |  |  | 90.7 |  |  | 87.7 |
Effect of potentially dilutive stock options | — |  |  | 0.2 |  |  | — |  |  | 0.3 |
Effect of potentially dilutive restricted stock units | — |  |  | 1.0 |  |  | — |  |  | 0.8 |
Diluted weighted average shares outstanding | 91.1 |  |  | 89.4 |  |  | 90.7 |  |  | 88.8 |
Outstanding anti-dilutive securities not included in diluted net 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:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Options outstanding to purchase common stock | — |  |  | — |  |  | — |  |  | — |
Unvested restricted stock units | 2.1 |  |  | — |  |  | 2.1 |  |  | 0.4 |
Senior convertible notes due 2022 | 4.0 |  |  | 4.0 |  |  | 4.0 |  |  | 4.0 |
Senior convertible notes due 2023 | 5.2 |  |  | — |  |  | 5.2 |  |  | — |
2023 Warrants | 5.2 |  |  | — |  |  | 5.2 |  |  | — |
Total | 16.5 |  |  | 4.0 |  |  | 16.5 |  |  | 4.4 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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