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Basic and Diluted Net Loss per Common Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Basic and Diluted Net Loss per Common Share | Basic and Diluted Net Loss per Common Share The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss attributable to common stockholders per common share:
(in thousands, except per share amounts) | Years Ended December 31,
Historical | 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net loss attributable to common stockholders | $ | (348,995 | ) |  | $ | (284,002 | ) |  | $ | (200,042 | )
Denominator: |  |  |  |  |
Weighted average common shares outstanding — basic and diluted | 185,790,021 |  |  | 153,355,144 |  |  | 134,401,588 |
Dilutive common stock equivalents would include the dilutive effect of common stock options, convertible debt units, RSUs and warrants for common stock equivalents. Potentially dilutive common stock equivalents were excluded from the diluted earnings per share denominator for all periods because of their anti-dilutive effect. For the year ended 2018 there was 40.9 million potential common shares outstanding as a result of the convertible debt that was excluded from the diluted net loss per share calculation because their effect would have been anti-dilutive. The table below presents potential shares of common stock that were excluded from the computation as they were anti-dilutive using the treasury stock method:
| Year ended December 31,
(in thousands) | 2018 |  | 2017 |  | 2016
Options to purchase common stock | 15,810 |  |  | 15,181 |  |  | 15,528 |
Convertible debt | 40,850 |  |  | 40,850 |  |  | 40,850 |
Outstanding warrants, convertible to common stock | 2,657 |  |  | 3,110 |  |  | 3,110 |
Unvested restricted stock units | 3,712 |  |  | 2,575 |  |  | 744 |
Vested restricted stock units, unissued | 91 |  |  | 50 |  |  | — |
Total number of potentially issuable shares | 63,120 |  |  | 61,766 |  |  | 60,232 |

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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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