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Income (Loss) Per Common Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Income (Loss) Per Common Share | Income (Loss) Per Common Share Basic income (loss) per common share is determined by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share is determined by dividing net income (loss) by the weighted average number of common shares outstanding, assuming all potentially dilutive shares were issued. We apply the treasury stock method to determine the dilutive weighted average common shares represented by the unvested restricted stock units and ESPP shares. 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 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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