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Net Income (Loss) Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Components of Basic and Diluted Net Income (Loss) Per Common Share Computations | The following tables summarize the components of the basic and diluted net income (loss) per common share computations (in thousands except par value and per share data):
| Three Months Ended |  |  | Nine Months Ended |
| September 30, |  |  | September 30, |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (numerator) | $ | (32,886 | ) |  | $ | 126,520 |  |  | $ | (84,549 | ) |  | $ | 71,690 |
Weighted average common shares (denominator) |  | 104,703 |  |  |  | 95,627 |  |  |  | 100,136 |  |  |  | 90,838 |
Net income (loss) per share | $ | (0.31 | ) |  | $ | 1.32 |  |  | $ | (0.84 | ) |  | $ | 0.79 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (numerator) | $ | (32,886 | ) |  | $ | 126,520 |  |  | $ | (84,549 | ) |  | $ | 71,690 |
Weighted average common shares |  | 104,703 |  |  |  | 95,627 |  |  |  | 100,136 |  |  |  | 90,838 |
Effect of dilutive securities - common shares issuable |  | — |  |  |  | 921 |  |  |  | — |  |  |  | 36 |
Adjusted weighted average common shares (denominator) |  | 104,703 |  |  |  | 96,549 |  |  |  | 100,136 |  |  |  | 90,873 |
Net income (loss) per share | $ | (0.31 | ) |  | $ | 1.31 |  |  | $ | (0.84 | ) |  | $ | 0.79 |
Schedule of Potentially Dilutive Common Stock Equivalent Securities | The computation of basic and diluted net loss per share for the three and nine months ended September 30, 2017 and 2016 excludes the common stock equivalents of the following potentially dilutive securities because their inclusion would be anti-dilutive:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Restricted stock units |  |  | 1,147,688 |  |  |  | 172,953 |  |  |  | 1,147,688 |  |  |  | 172,953 |
Senior convertible notes |  |  | 814,561 |  |  |  | -- |  |  |  | 814,561 |  |  |  | 814,561 |
Warrants |  |  | 31,856 |  |  |  | 9,740,597 |  |  |  | 31,856 |  |  |  | 9,740,597 |
Employee stock purchase plan |  |  | 142,888 |  |  |  | 14,079 |  |  |  | 142,888 |  |  |  | 14,079 |
Stock options |  |  | 7,183,837 |  |  |  | 5,689,486 |  |  |  | 7,183,837 |  |  |  | 5,689,486 |
|  |  | 9,320,830 |  |  |  | 15,617,115 |  |  |  | 9,320,830 |  |  |  | 16,431,676 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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