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Net Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | Note 7. Net Income (Loss) Per Share Net income (loss) per share was calculated as follows:
| Year Ended December 31, |
(in thousands, except per share data) | 2019 |  |  | 2018 |  |  | 2017 |
Net income (loss) - basic and diluted | $ | 37,012 |  |  | $ | 21,111 |  |  | $ | (142,542 | )
Weighted average common shares outstanding, basic |  | 91,627 |  |  |  | 90,235 |  |  |  | 88,089 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase program |  | 25 |  |  |  | 11 |  |  |  | — |
Stock options |  | 2,559 |  |  |  | 3,228 |  |  |  | — |
Restricted stock units |  | 449 |  |  |  | 564 |  |  |  | — |
2024 Notes |  | 1,072 |  |  |  | 1,348 |  |  |  | — |
Weighted average common shares outstanding, diluted |  | 95,732 |  |  |  | 95,386 |  |  |  | 88,089 |
Net income (loss) per share, basic | $ | 0.40 |  |  | $ | 0.23 |  |  | $ | (1.62 | )
Net income (loss) per share, diluted | $ | 0.39 |  |  | $ | 0.22 |  |  | $ | (1.62 | )
Shares which have been excluded from diluted per share amounts because their effect would have been anti-dilutive include the following:
| Year Ended December 31, |
(in thousands) | 2019 |  |  | 2018 |  |  | 2017 |
Stock options and restricted stock units |  | 2,144 |  |  |  | 887 |  |  |  | 7,436 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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