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NET INCOME (LOSS) PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Net Income (Loss) Per Share | Net income (loss) per share was calculated as follows:
| Year Ended December 31, |
(in thousands, except per share data) | 2018 |  |  | 2017 |  |  | 2016 |
Net income (loss) - basic and diluted | $ | 21,111 |  |  | $ | (142,542 | ) |  | $ | (141,090 | )
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic |  | 90,235 |  |  |  | 88,089 |  |  |  | 86,713 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase program |  | 11 |  |  |  | — |  |  |  | — |
Stock options |  | 3,228 |  |  |  | — |  |  |  | — |
Restricted stock units |  | 564 |  |  |  | — |  |  |  | — |
2024 Notes |  | 1,348 |  |  |  | — |  |  |  | — |
Diluted |  | 95,386 |  |  |  | 88,089 |  |  |  | 86,713 |
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.23 |  |  | $ | (1.62 | ) |  | $ | (1.63 | )
Diluted | $ | 0.22 |  |  | $ | (1.62 | ) |  | $ | (1.63 | )
Schedule of Anti-Dilutive Shares Excluded from Diluted Per Share Amounts | 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) | 2018 |  |  | 2017 |  |  | 2016 |
Stock options and restricted stock units |  | 887 |  |  |  | 7,436 |  |  |  | 6,995 |

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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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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