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Basic and Diluted Net Loss per Common Share | 6 Months Ended
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Jun. 30, 2019
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:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands, except per share amounts) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (84,551 | ) |  | $ | (61,833 | ) |  | $ | (204,850 | ) |  | $ | (111,751 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic and diluted |  | 238,089,824 |  |  | 188,621,423 |  |  | 225,848,013 |  |  | 182,303,128 |
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. 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:
|  | As of June 30,
(in thousands) |  | 2019 |  | 2018
Options to purchase common stock |  | 17,849 |  |  | 15,869 |
Convertible notes |  | 462 |  |  | 40,850 |
Outstanding warrants, convertible to common stock |  | 2,555 |  |  | 2,657 |
Unvested restricted stock units |  | 5,885 |  |  | 3,556 |
Vested restricted stock units, unissued |  | 227 |  |  | 111 |
Total number of potentially issuable shares |  | 26,978 |  |  | 63,043 |

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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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