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Net Income (Loss) Per Common Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Income (Loss) Per Common Share | 12. Net Income (Loss) per Common Share Basic net income (loss) per share excludes dilution for potentially dilutive securities and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share reflects the potential dilution under the treasury method that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. For periods where the Company has presented a net loss, potentially dilutive securities are excluded from the computation of diluted net loss per share as they would be antidilutive. The following tables summarize the components of the basic and diluted net income (loss) per common share computations (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income (numerator) |  | $ | (86,975 | ) |  | $ | (117,333 | ) |  | $ | 125,664 |
Weighted average common shares (denominator) |  |  | 144,136 |  |  |  | 104,245 |  |  |  | 92,053 |
Net (loss) income per share |  | $ | (0.60 | ) |  | $ | (1.13 | ) |  | $ | 1.37 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income (numerator) |  | $ | (86,975 | ) |  | $ | (117,333 | ) |  | $ | 125,664 |
Weighted average common shares |  |  | 144,136 |  |  |  | 104,245 |  |  |  | 92,053 |
Effect of dilutive securities - common shares issuable |  |  | — |  |  |  | — |  |  |  | 32 |
Adjusted weighted average common shares (denominator) |  |  | 144,136 |  |  |  | 104,245 |  |  |  | 92,085 |
Net (loss) income per share |  | $ | (0.60 | ) |  | $ | (1.13 | ) |  | $ | 1.36 |
Common shares issuable represents incremental shares of common stock which consist of stock options, restricted stock units, warrants, and shares that could be issued upon conversion of the senior convertible notes and the Mann Group Loan Arrangement. Potentially dilutive securities outstanding that are considered antidilutive, in the periods noted below, are summarized as follows (in shares):
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  |  |  | 2016 |
Vesting of restricted stock units |  |  | 691,266 |  |  |  | 1,135,216 |  |  |  |  |  | 702,867 |
Employee stock purchase plan |  |  | 307,395 |  |  |  | 136,660 |  |  |  |  |  | 43,672 |
Exercise of common stock options |  |  | 10,976,118 |  |  |  | 7,089,440 |  |  |  |  |  | 5,530,256 |
Conversion of convertible notes into common stock |  |  | 3,629,627 |  |  |  | 6,875,272 |  |  |  |  |  | 814,561 |
Conversion of convertible notes payable to related party into common stock |  |  | 21,909,541 |  |  |  | — |  |  |  |  |  | — |
Exercise of common stock warrants |  |  | 31,851 |  |  |  | 31,856 |  |  |  |  |  | 9,740,597 |
Exercise of warrants associated with public offering |  |  | 26,666,667 |  |  |  | — |  |  |  |  |  | — |
Exercise of warrants associated with direct placement |  |  | 14,000,000 |  |  |  | — |  |  |  |  |  | — |
|  |  | 78,212,465 |  |  |  | 15,268,444 |  |  |  |  |  | 16,831,953 |

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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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