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Income (Loss) Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Income (Loss) Per Share, Basic and Diluted | The following table summarizes the basic and diluted income (loss) per share calculations (in thousands, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator |  |  |  |  |  |  |
Net income (loss) | $ | (6,999 | ) |  | $ | 2,296 |  |  | $ | (74,835 | ) |  | $ | (50,317 | )
Denominator |  |  |  |  |  |  |
Basic weighted average common shares | 224,182 |  |  | 223,056 |  |  | 223,912 |  |  | 222,847 |
Restricted stock units (1) | — |  |  | 525 |  |  | — |  |  | — |
Diluted weighted average common shares (1) | 224,182 |  |  | 223,581 |  |  | 223,912 |  |  | 222,847 |
Income (loss) per common share: |  |  |  |  |  |  |
Basic | $ | (0.03 | ) |  | $ | 0.01 |  |  | $ | (0.33 | ) |  | $ | (0.23 | )
Diluted | $ | (0.03 | ) |  | $ | 0.01 |  |  | $ | (0.33 | ) |  | $ | (0.23 | )
(1) | Approximate number of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted income (loss) per share as the effect would be anti-dilutive when results from operations are at a net loss position. | 1,075 |  |  | — |  |  | 779 |  |  | 624 |

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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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