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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Results of Operations | The following is a summary of the quarterly results of the Company for the years ended December 31, 2017 and 2016 (unaudited, in thousands, except for per share data):
|  | Year Ended December 31, |  |  | Year Ended December 31 |
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |  |
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 15,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 15,000 |
Operating expenses |  |  | 35,857 |  |  |  | 41,828 |  |  |  | 38,436 |  |  |  | 46,251 |  |  |  | 162,372 |
Net loss |  |  | (19,264 | ) |  |  | (40,280 | ) |  |  | (36,887 | ) |  |  | (44,659 | ) |  |  | (141,090 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  | $ | (0.22 | ) |  | $ | (0.46 | ) |  | $ | (0.43 | ) |  | $ | (0.51 | ) |  | $ | (1.63 | )
Shares used in the calculation of net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  |  | 86,497 |  |  |  | 86,694 |  |  |  | 86,784 |  |  |  | 86,874 |  |  |  | 86,713 |
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | — |  |  | $ | 6,335 |  |  | $ | 60,774 |  |  | $ | 94,517 |  |  | $ | 161,626 |
Operating expenses |  |  | 79,932 |  |  |  | 63,603 |  |  |  | 66,769 |  |  |  | 82,683 |  |  |  | 292,987 |
Net (loss) income |  |  | (78,326 | ) |  |  | (59,985 | ) |  |  | (11,125 | ) |  |  | 6,894 |  |  |  | (142,542 | )
Net (loss) income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.90 | ) |  | $ | (0.68 | ) |  | $ | (0.13 | ) |  | $ | 0.08 |  |  | $ | (1.62 | )
Diluted |  | $ | (0.90 | ) |  | $ | (0.68 | ) |  | $ | (0.13 | ) |  | $ | 0.07 |  |  | $ | (1.62 | )
Shares used in the calculation of net (loss) income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 87,283 |  |  |  | 88,063 |  |  |  | 88,325 |  |  |  | 88,665 |  |  |  | 88,089 |
Diluted |  |  | 87,283 |  |  |  | 88,063 |  |  |  | 88,325 |  |  |  | 92,659 |  |  |  | 88,089 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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